I also got the same shit hapen like this on my "Local" exchange.

I withdraw "XRP" from Stake to Tokocrypto (Indonesia Exchange), the weird thing every low amount transaction is credited but while I withdraw more than 1,000 XRP the balance is not credited. I contacted them, they said the balance transaction is came from gambling activity and they can't accept that. The lucky things, I can request the refund address because the sender & my deposit stake XRP is different.

Because of this issue, I always withdraw to personal wallet first then go to exchange.