I am running Remote Desktop version 10.0.14.1182 on Android 12.
I can successfully connect to a remote desktop session and control it. However, if I tab out of the RD app and into it again, whenever I type a character on my keyboard (SwiftKey, but also happens with the built in keyboard), the character is sent twice. If I tab out and in again, it will send the character three times and so forth. It is very annoying.
If I disconnect from the remote desktop session and connect again, it works just fine.
I do not have the issue in other remote desktop apps, so I assume it is an issue with your app.