Paint Flaking Off, any advice appreciated

[wind sail]

Hello everyone, first of all i really appreciate any and all the feedback i can get on the following matter given that I'm a dumbass and left it all till the last minute.
I was painting a prop and the paint started flacking like crazy and I have no clue what may have caused it since I'm using the same brand. The base coat was rust-oleum primer, then it received a white coat of Montana Hardcore White. So far it was behaving perfectly. The flaking occurred when i used Montana Hardcore Green. Any recommendations or any idea what might have caused it? I can provide more details if you think it might help understand what happened. Thanks in advance

[smoky bay]

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[viral zodiac]

Honestly, quite a few reasons it can happen.

[wind sail]

Thanks for the reply!
Yeah, that's the worst part. I think the surface was well prepared since I've been doing it the same way for a year and never had problems + the white coat got good adhesion;
As per the drying time, i left it over night (like 10 hours) in a fairly dry room and before applying the green, i checked that it was in fact dry;
I went to the store where i bought them and they confirmed that the primary, white and green are all synthetic based so they should work together;

With all that in mind I've narrowed it down to either: 10h not being enough to dry it, accidentally spraying too much green, or witchcraft

Plus, idk if it helps but the green started flaking basically as soon as it was sprayed down, i was only half-way through the prop and the 1st part as already flaking