Hello,
For the duration that the coin adapter was not running, your website was not accepting IPN messages for any deposits. The funds for these deposits are in the CoinPayments wallet as always, but the plugin doesn’t know about them. The CoinPayments platform would have attempted a few times to resend the messages, and then some of these would have been marked as failed permanently to get delivered. All you have to do is log in to your CoinPayments platform, find out which IPNs were not delivered, and resend them. Then all deposits will be accounted for in the plugin.
Do not worry about accidentally re-sending messages that were already sent and accepted, they will not be counted twice because each deposit has a unique ID.
with regards