Possible pet group bug?

[Agent Blue]

I've been a member since 2011 and have always moved my doubles to a separate group for trading. (I consider myself very experienced in organizing my pets lol). Lately, going back to look over my pet groups, I've noticed a lot of doubles that I definitely would have moved but are sitting in my not-trade groups. I also noticed pets in my trading groups that AREN'T doubles which is troublesome to me because I don't want to accidentally trade away pets I want to keep.

I'm just wondering if anyone has noticed this, if it's a known bug, or if I'm actually crazy and made these mistakes myself?!

Thanks guys!

[axelandria]

This won't be a bug.

I always use this handy Chrome extension/Firefox add-on. You can sort through your doubles easier!

[Agent Blue]

This won't be a bug.

I always use this handy Chrome extension/Firefox add-on. You can sort through your doubles easier!

Dude you just changed my LIFE. Thank you x10000