@meganleeming48 Wix released a performance release about two months ago. It could be related to that. However, you said that this issue was recent. How recent?
If the code errors were recent, then they could be causing the new performance release to cause the flickering.
I see that when running the site under the old system there is no flickering. But the errors in fact are a problem and need to be fixed. Fixing the errors may actually fix the flickering problem.