I was able to replicate the issue in one of the demo farm OpenEMR interfaces from my chrome web browser.
This table that you’re seeing should be generated by the following php file given the specified input after the ?
In the style section you’ll see the following
This isn’t really my area of expertise, so I may be completely wrong, but maybe a first step might be to try to increase that padding number from 5 pixels to something higher. It might force the column to have a fixed minimum length that it won’t decrease past as the table columns get narrower as more data is added.