I got a problem with tribbles too, I've tried several times to get them to produce higher tiers tribbles but have repeatably gotten tier one tribbles. I have only twice managed to get high tier tribbles both of which were Tribble Mat.
I am curious if others have experienced problems with the tribble breeding process and if it is broken/bugged.
Edit: To answer the OP I get the buff status from my tribbles displaying correctly
After hours and hours of feeding I managed to get a tribble with buffs and it actually shows in my buff list.
The problem is, breeding seems to be broken or drastically changed. I gave them everything from common to rare food and all that came out were Tier 1 Tribbles and 1 [Matt] (which should be impossible to breed with Tier 1).
So, after some more testing and feeding them every little piece of food I was able to loot... Only Tier 1 Tribbles and [Mat] can be breeded. The [Mat] will be created with the food that is usually needed to breed them out of [Dea] and [Cav], everything else is a waste right now.