Transform animation not working for some objects

Hi!
I'm trying to change the size of some objects after the player scores enough points. I struggled with this a bit today because the objects does not grow. After some checking I could see that the scale(x, y, z) did actually change to desired number.
Since these objects was imported .fbx files I figured it may be something wrong with them. So I replaced them with some ordinary cubes.

...and lo and behold. It worked.

My question is have any of you had this kind of problem? Might be something simple I overlooked. I can also mention that I tried changing the objects size with both Animator and with a script, changing the localScale. Both worked for the cubes but not the imported objects.

Thanks in advance!