How to fix Kanban board where the headers are not aligned to their columns?

[sleblanc@g2planet.com]

We have an individual that is seeing misaligned headers on the Kanban board.  This problem doesn't appear to occur with other users.  We're wondering if there's a configuration somewhere we need to set to help address this.  

User's Step- go to a Kanban Board of any project - Headers of column do not align. 

If the user resizes the window, the columns align as expected.

The Individual is on the following computer - 

With the following display settings

Finally, we're running Jira - 7.9.2.  

Please let me know if there's more details I can offer. 

[sleblanc@g2planet.com]

Firefox - 60.0.1 (64-bit)
Web Developer 
Cisco WebEx Extension

And I'm now seeing it on more now that we've check other Firefox users' browsers.  Safe mode does not resolve the issue. 

It appears to be for Firefox users only.  Crome works as expected.  

[Mirek]

If other user do not see this problem it is probably a client issue. What browser user is using? Can he try a different one? Any browser plugins that might be making this behavior? Can user try to run browser in safe mode without any extensions?