diff --git a/gdbr/annotate.py b/gdbr/annotate.py
index 2b31b89..5d542aa 100644
--- a/gdbr/annotate.py
+++ b/gdbr/annotate.py
@@ -338,11 +338,16 @@ def get_homology_hard(sv_data, ref_loc, qry_loc, refdbdir, qryworkdir, ref_chr_l
     ref_len = ref_end - ref_start + 1
     qry_len = qry_end - qry_start + 1
 
-    ref_ins_chrom, ref_ins_start, ref_ins_end = get_non_homology_insertion_loaction(ref_seq[chrom][ref_start - 1:ref_end], near_seq_kb_baseline,
-                                                                                    refdbdir, sv_id, chrom, qryworkdir, ref_start, ref_end, ref_chr_list, num_cpus)
-        
-    qry_ins_chrom, qry_ins_start, qry_ins_end = get_non_homology_insertion_loaction(qry_seq[chrom][qry_start - 1:qry_end], near_seq_kb_baseline,
-                                                                                    refdbdir, sv_id, chrom, qryworkdir, ref_start, ref_end, ref_chr_list, num_cpus)
+    ref_ins_chrom, qry_ins_chrom = False, False
+
+    # megablast word_size
+    if ref_len >= 28:
+        ref_ins_chrom, ref_ins_start, ref_ins_end = get_non_homology_insertion_loaction(ref_seq[chrom][ref_start - 1:ref_end], near_seq_kb_baseline,
+                                                                                        refdbdir, sv_id, chrom, qryworkdir, ref_start, ref_end, ref_chr_list, num_cpus)
+            
+    if qry_len >= 28:
+        qry_ins_chrom, qry_ins_start, qry_ins_end = get_non_homology_insertion_loaction(qry_seq[chrom][qry_start - 1:qry_end], near_seq_kb_baseline,
+                                                                                        refdbdir, sv_id, chrom, qryworkdir, ref_start, ref_end, ref_chr_list, num_cpus)
     
     is_find_ins_ref = isinstance(ref_ins_chrom, str)
     is_find_ins_qry = isinstance(qry_ins_chrom, str)
@@ -560,14 +565,7 @@ def annotate_main(ref_loc, qry_loc_list, sv_loc_list, hom_find_len=2000, temp_in
             sv = [f'GDBr.{qry_ind}.{sv[0]}'] + sv[1:]
             if sv[2] in {'DEL', 'INS', 'SUB'}:
                 hom = list(hom_list.pop())
-                if hom[3] is None:
-                    hom_str = '*'
-                elif hom[4] is None:
-                    hom_str = str(hom[3])
-                else:
-                    hom_str = f'{hom[3]}:{hom[4]}'
-                
-                bed_data_list.append((sv[3], sv[4] - 1, sv[5], sv[0], hom[2], hom_str))
+                bed_data_list.append((sv[3], sv[4] - 1, sv[5], hom[2], -1 if hom[3] is None else hom[3], -1 if hom[4] is None else hom[4], sv[0]))
                 output_data.append(sv + hom[2:])
             else:
                 output_data.append(sv)
@@ -592,4 +590,4 @@ def annotate_main(ref_loc, qry_loc_list, sv_loc_list, hom_find_len=2000, temp_in
     
     # export merge bed file
     if len(qry_loc_list) > 1:
-        bed_df.groupby([0, 1, 2, 4, 5], as_index=False).agg(lambda x: ';'.join(sorted(set(x)))).to_csv(os.path.join(dsbr_save, 'bed', 'merge') + '.GDBr.result.bed', header=False, sep='\t', index=False)
\ No newline at end of file
+        bed_df.groupby([0, 1, 2, 3, 4], as_index=False).agg({5: lambda x: ';'.join(sorted(set(x), key=lambda t: int(t.split('.')[1])))}).to_csv(os.path.join(dsbr_save, 'bed', 'merge') + '.GDBr.result.bed', header=False, sep='\t', index=False)
\ No newline at end of file
diff --git a/gdbr/utilities.py b/gdbr/utilities.py
index 57b299f..2d51139 100644
--- a/gdbr/utilities.py
+++ b/gdbr/utilities.py
@@ -522,7 +522,7 @@ def get_min_sv_size(vcf_loc):
 
 def clean_workdir(workdir):
     for item in os.listdir(workdir):
-        if os.path.isdir(os.path.join(workdir, item)) and item[-5:] == '_gdbr' and (item[:-5] == 'db' or item[:-5].isdigit()):
+        if os.path.isdir(os.path.join(workdir, item)) and item[-5:] == '_gdbr' and (item[:-5] == 'db' or item[:-5].isdecimal()):
             shutil.rmtree(os.path.join(workdir, item))
 
     if len(os.listdir(workdir)) == 0:
@@ -750,7 +750,7 @@ def draw_result(savedir, pre_type_cnt, cor_type_cnt, del_type_cnt, ins_type_cnt,
             s = sns.histplot(x=temp_ins_hom_cnt.keys(), weights=temp_ins_hom_cnt.values(), binrange=tar_range, binwidth=1, element='step', color=cb_hex_list[0], alpha=1, ax=ax)
             s.set(xlabel='(micro)homology (bp)', ylabel='Variant count')
         ax_list[0].set_title('Templated insertion respective homology distribution')
-        save_fig(fig, savedir, 'temp_ins_hom_distribution')
+        save_fig(fig, savedir, 'result_temp_ins_hom_distribution')
 
     # Different locus DSBR respective homology distribution
     if diff_locus_dsbr_hom_cnt:
@@ -759,4 +759,4 @@ def draw_result(savedir, pre_type_cnt, cor_type_cnt, del_type_cnt, ins_type_cnt,
             s = sns.histplot(x=diff_locus_dsbr_hom_cnt.keys(), weights=diff_locus_dsbr_hom_cnt.values(), binrange=tar_range, binwidth=1, element='step', color=cb_hex_list[0], alpha=1, ax=ax)
             s.set(xlabel='(micro)homology (bp)', ylabel='Variant count')
         ax_list[0].set_title('Different locus DSBR respective homology distribution')
-        save_fig(fig, savedir, 'diff_locus_dsbr_hom_distribution')
\ No newline at end of file
+        save_fig(fig, savedir, 'result_diff_locus_dsbr_hom_distribution')
\ No newline at end of file