the issue is: there is some utxo in your wallet that it is …
the issue is: there is some utxo in your wallet that it is not being recognized correctly by our UI code even though its safe and confirmed onchain. your wallet has thousands of utxos so it's difficult to track down which one is causing issues and why but we are working on this. I am not sure if the actual sending code has the same issue, it might not and sending might work, but I can't guarantee that. In case there is some small balance that can't be sent through Treechat, you can download the wallet and import it into Yours wallet and that should work