Just to clarify that it seems like this thread has two different issues.
- One being the descriptive text about the pet bonuses being applied.
- The second about the Single Troop bonus pet buff not applying in battles except for PVP Defense.
1. Descriptive Text Issue
As for the first issue, this is not a bug. There is not meant to be any descriptive text that your pet buff is currently applied.
2. Buffs Not Applying Issue
And for the second issue, I have a couple quick questions for further investigation.