Pet in stable order changes

[Excuses]

I don't know this happens only to me, but pet orders changes randomly when I open a new pet and lvl it.
Not adding new pet on top, I mean its order got completely changed on same lvl pets.
1 2 3 4 5 6 7 became
3 5 2 1 7 4 6.
It's not by its rarity, or alphabetic order. Somehow it's just so random atm.

It's very annoying to find the right pet sometimes.

Would you make my stable managable?
Regardless of its lvl, I just want my favorite pets to be on top of my list.

I'm pretty sure there has been this kind of thread before, however recently my stable is messed up after I Lvled some pets. I don't know if this should be on technical issue. But hope there would be a change on stable.
Thank you.