20263．12．0 64-bit Unexpected echo and input during Telnet connection

I encountered the following issues while establishing a Telnet connection:
1. Typing a single character results in two characters being displayed.
2. The echo does not show up in accordance with the device's output.
3. The right-click on the mouse activates the copy content input function. How should I solve this problem?
Here is the screenshot of my settings. I hope it will be helpful.