Cannot send from non Custodial L-BTC wallet

[bkminer1984]

I try to test coinos.io by sending BTC into the custodial wallet and then sending L-BTC from custodial to the non-custodial wallet, This process goes smoothly.
Then I try to send back from L-BTC non-custodial to the custodial wallet but it shows errors while I try to set a fee.
The error message is can not finalize input #0 and Malformed UTF-8 data.
Then I searched for the solution in the telegram group and found one fix by refreshing and re-entering the password.
I try to re-input my password but it can't solve this problem (As I recorded).

I recorded the problem and post it as a 30 seconds long gif here.