The Live UI tool relies heavily on a lot of complex internal JavaScript libraries to manipulate the DOM in real time. There is probably a conflict with the plugin or library you're using to create the circular progress bar. A lot of code snippets that are available online are simply not built very well and can cause issues like this (even if you weren't using Pega at all) when you start mixing and matching premade plugins without understanding how they fully work. This is why Pega doesn't recommend doing so and throws a guardrail warning.

I'd start investigating by looking at the JS console in your browser developer tools and see if you're getting any warnings or errors.  You'd need to adjust your circular progress bar code depending on what you find. It's not a LiveUI problem.