App displays differently on different machine. Where to look?

My Co-worker is running our application and everything looks jumbled and overflows the page. We are using the same OS and have screens with the same resolution. We have successfully ran the program on other PCs, OS, and resolutions without issue before.

My first thought was to check the webcontents zoom factor on his machine, but we automatically set it to normal zoom in the setup code.

Is there anything else we should be checking? Any other PC settings that could be affecting this?

Thanks

What OS? Are you using any system fonts in your project? What about global system scaling settings (if on Win 10 that’s in the Display Settings)?