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The attached picture shows what's going wrong I'm wondering if anyone else has had this problem and if so how you fixed it.

I'm using WinRoTTGL 1.70.

Ironically, I posted a guide on getting this to run 10 years ago but that was an older computer and os and I didn't have this problem then.
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Right click the exe you use to run the program, click on Properties, click on the Compatibility tab, at the bottom is a box that says "Change high DPI settings" click on that, at the bottom of the new window that opens there's a setting called High DPI scaling override, check the box that says Override high DPI scaling behavior.

That should fix it if you've got Windows 10.