online casino transaction history missing one deposit but balance includes it

Noticed something odd today after a night of trying out new slots. My account balance is higher than what my transaction history shows, like it's including a deposit I made, but that deposit itself is totally missing from the records. The funds are definitely there and usable, so it's not like the casino is stealing, just... weird accounting.

This has got me wondering if this is a bug or if there's some delay in updating transactions but not balances. Anyone seen something like this before? Should I just leave it since the money’s there, or does this usually signal deeper issues down the line?