Any idea why I get a vanilla airdrop (slow fall, no smoke, vanilla loot) coming from planes sometimes which also bring
the normal Fancy Drops?

No idea. Could possibly a plugin conflict or one of those rare Gremlins that you are not suppose to feed after midnight. Not really something that can be reproduced. I only personally ever heard it happening 1 other time and then they said it never happened again.

I have had the same thing happen with multiple drops, all the containers except 1 will have my normal minimum 12 items the odd one out will only have 4-6.  only happens once in a while but with an airdrop every 50-120 minutes its not much to worry about,