I haven't noticed that. Did you recently go up a tier level? Since I have no skins left in the 5 key crates, I only use the 10 key ones. I save up 100 to do 10 tries. Usually 1 or 2 are a-coins, 2 are skins, and the rest are credits. It's pretty consistant for me. I'm going to be going up a tier soon, so dreading having to go thru the 5 key ones again to up the odds in the 10 key. I do want to mention that I don't care about skins, I just want the credits and a-coins.

Welcome to platinum tactics have you checked the chance it's went down by 400% for a coin after last update 

I will suggest to hold on fortune keys don't use any gather them until they change it back even if you gather 1000+ before they get back on track 

Are you talking about the 10-key fortune vault? Ever since I've seen it the acoins percentage has been approx 2% for 750 acoins and 5% for 375. It's still the same.

Maybe a few years ago it was different?

This is the 10 key vault for me right now.

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These are mine for 10 keys. I guess there is a difference based on the number of unlocked rare skins from 5 keys 

Thanks. These are good percentages to look forward to :-). Maybe in the case of the OP, assuming they are talking about the 10-key vaults, one possibility is that new skins caused a revision of their specific numbers.