contents display is out of order on window maximize

[tan9p]

CMD,Powershell If I open a file on init window and maximize the window, then I quit the nano, and reopen the file(or another file)，the display is out of order like the following picture.

However when I open the file on the maximize window, the display is right. It seems that if I change the window size when the nano is open，the display will be wired.