WordPress Update 5.0.2

Hello,

Since I updated WordPress (5.0.2) and the Parabola theme version (2.3.1) the top menu bar isn’t working properly, also a thin blue line goes across the entire page on some of my website pages (http://www.csmsecuritylocksmiths.uk). I tried to remove the line, but they are not visible on visual or html elements of the page(s) with the page editor.

Also a plugin I use ‘Hide Title’ which hides page title no longer works either. It is a popular plugin which states it is compatible with my version of WordPress.

I’ve tried reinstalling WordPress, but still had the same issue. I’ve currently set my website back to a backup version.

I can attach images of the problems if this helps?

Kind Regards,
Chris

Website: www.csmsecuritylocksmiths.uk