Um, so, it's not the first time I have this problem and I was wondering if it was just me or something general?
I tried to edit trades several times or remove accidental additions to them and then I add something different or send the trade and the pet I was not supposed to trade is still there/re-appears! Just now, if I hadn't been fast enough, I would have traded a very special pet someone wanted to trade with me (which was not gonna happen, eep, never trade my personal pets) and eeh, this made me realize how I should say something about it, maybe it's a glitch?