This happened a day/two days before the server maintenance(or problem) we are having at the moment. I have been in a few games and sometimes they'll be items that I can't pick up (yes I have space). Sometimes it's small like a Monomate when I'm 6/10 on them, other time it's been armor/weapons that it wont let me pick up even with space.
I also got kicked out of a game for "Exceeded item amount". I have no idea if this is due to not being able to pick up items. Maybe it thinks I'm 30/30 or 10/10 on something and when it did finally let me pick up something, it kicked me off for going over.
Well I hope that helps with game tweaks.