Is it bugged or are AC´s not supposed to go past level 12? Noticed that my follower who had an AC with boon companion feat as ranger and is level 16 still has a pet of level 12 even tho with the feat the animal should be at his class level since all his levels are in ranger.

Since not fully familiar with Pathfinder in comparison to 3.5, are AC´s capping out at level 12 or is it just another bug?

pet is always your level -3 it seems. 17 at 20

that feat works whenever it likes. it was supposed to be fixed, but not really. best bet to make it work is to take it before you are done with a pet class as it still gets applied when you level your pet class afaik.

the math works out as well. 15 ranger-3=12

Google translater:

2.0.7B - "boon companion" still doesn't work
I checked animal with "boon companion" and without it. On my 20lvl (forest sorcerer) mastodon has just 16 lvl and don't changed his level, stats and BAB, whatever I got "boon companion" or not.

edit: That feature seems like a "natural bond" in nwn, but in description in rus version that presents like +4 levels for pet immediately, with limit to 20 level. o_0