Welcome to the forum @Champasit
This is not a problem that has been reported previously. Which versions of node red and the dashboard are you using? Check in Manage Palette. If not the latest dashboard (1.30.2) then upgrade it and check again.
Which browser are you using and can you try a different one?
Could you create a simple test flow so that we can attempt to replicate the problem please? Something like just an inject to inject the data, and the table node. Then select those nodes and use the menu Export -> Copy to clipboard and paste it here. When pasting, in order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
See this post for more details - How to share code or flow json
