Blog breaks website for some browsers?

I apologize in advance for any confusion I may cause. I am slowly trying to learn wordpress and to a lesser extent php at the same time. I became the new IT person at a small company that had an even smaller company create their webpage for them using php. The previous IT person added a wordpress blog to the main website as can be seen here https://ww2.distek.com/blog/

While on the blog page, if you are using chrome, hovering over “software services” still activates a dropdown menu. However if you use internet explorer the link simply turns white and the drop down does not function. Compatibility mode doesn’t seem to help the issue.

honestly I’m a server/networking person and not a web developer, but of course I got given the webadmin hat to wear.

My question is would this be a problem with wordpress not liking the website coding with IE/firefox or vice versa? I’ll take idea, suggestions, guesses even on where to start to troubleshoot.