When ice blade got nerfed, the way it happened is that they deactivated an old skill and added another one. The 2 skills had similar icons, similar behavior, but different internal IDs, same as anything in ROM does. I am thinking if buffs worked same way.
What is likely to have happened here is that the pet buff database was updated, but not for every pet. Some pets, including Leo one, got the updated buff. Some, like Pisces pet, got the old buff, and if they deactivated it, it could be actually doing not even just 2 or 3 points, like it used to.
Actually, do you get a buff that doesn't do anything to add to attributes, buff that adds 2 or 3 points, or no buff at all? Check your buff list, that might help to narrow down the problem. When I get a properly working buff from my Legendary Leo (and adult Gemini), I get a buff on my buff list. As I recall, the old broken 2 or 3 points, not percent, buff, was also showing up on buff list.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.