Hello,
Confirmation counts are updated when the plugin gets notified from the wallet about changes in transaction state.
It seems that the plugin is not receiving walletnotify curl requests. This could be for any number of reasons (dns, firewalls, nat settings, etc).
Please check the relevant article https://www.dashed-slug.net/howto-debug-an-incoming-deposit-full-node-wallet/ focusing on steps 5 and 6. You can try to notify the wallet manually through your browser to see if the confirmation count for a deposit changes. You can also login to your wallet server to see if it can contact the plugin via curl.
Please check the above and let me know if you have any further questions.
with regards