Faulty/Quirky? completion with methods starting with "p".

[FrostbittenKing]

Hi, I'm using rsense in combination with auto-complete and some other stuff(yas, etc). It works pretty well, except, see title.
Little example:
'a'.a: menu pops up with all kind of stuff from ac-complete (the rsense stuff pops in after 2 or the chars - the ac-sources order is not as I want it, but that's a different issue), ..
'a'.a shows (after deleting the 2 chars added as mentioned before): all? and any?. So more or less perfekt.
When I type 'a'. (as before ...all methods, variables stuff pops up), incl. 4 methods starting with p, as soon as I write p eg: 'a'.p, the completion popup menu disappears, like there were no methods starting with p. The methods starting with p only popup when "I force it down rsense's/auto-complete's throat" - in other words, when I explicitly invoke ac-complete-rsense. This really makes no sense to me why it only doesn't work with methods starting with "p".
Since I don't know if it is a problem with rsense or autocomplete, I randomly picked rsense as the culprit ;). Hope, you can help. If you need to, I could zip and upload my emacs config somewhere (it's quite complex), and the installation from zero (I pushed it to my github repo) is not that easy yet. If I zip it as I use it at the moment, it should work as is on your system.