It seems that the tooltip for various buffs are incorrect. I suspect the tooltip displays a static value which is not updated even if you have talents or items that impact their values.
For example, my Warlock has the “Improved Imp” talent. This increases the effect of the Imp’s Bloodpact ability from 42 to 54 (30%). While this appears to work correctly, unfortunately the buff tooltip displays the old value. See the example linked below. The bug is also evident in other abilities that have been modified such as Demon Armor and possibly other abilities.
htt ps://ibb.co/3sTZmFr
The degree of the buff’s effect is now misleading to myself and the group, may complicate calculating effective strategies and may create doubt as to whether the abilities are working as intended.
I can’t imagine the buff tooltips have any good reason to display this way, so I suggest it is changed so the player and their party members can be clear on what certain buffs are doing for them. If the game intends to communicate to players that the value is not it’s “default/usual” value, you can even recolour the value in green (if better than default) or red (worse than default), similar to how character stats are presented.