Zenmap cannot print Nmap massage normally,Sometimes the textbox cannot work

[thebiggod]

Describe the bug
A clear and concise description of what the bug is.
1.Zenmap cannot print Nmap massage normally, at first it can print the message. But if you turn to other GUI pages and get beck ,the GUI doesn't show anything, Here is the picture.

2.Sometimes the textbox cannot work , you cannot input in it ,no cursor blinks.

To Reproduce
Steps to reproduce the behavior, including window titles and command-line options.

1.Open zenmap ,
2.Scan some domainname
3.click other pages like PORTS/HOSTS or SCAN or something
4.click back to the page"Nmap PRINT"
5. Nothing left

as for the second bug"the textbox doesnt work", it occurs occasionally at anytime.

Expected behavior
A clear and concise description of what you expected to happen.
hope everything gets normal
Version info (please complete the following information):

• OS: Windows 10 1909 18363.959

Zenmap 7.80
Nmap version 7.80

Additional context
I try it on my two computers , the bugs occurs on both of them