Extra Language from shapeshifting?

[Khazrak]

So, I know I didn't pick Elven at character creation as a language. I only had 14 INT, and so besides the 4 languages I started with (for being a deep gnome ranger), I picked Dwarven and Terran. Yet... my character also speaks Elven now, probably from having been in Elf form a lot.

Now, I will admit: I don't mind having this extra language. But I imagine I got it as a result of a bug involving the shapeshifting forms.

I plan NOT to list it in my character's bio for now in case I'm wrong. I feel like this is prooooobably a bug.