just to narrow down the problem and help us debug the issue is it possible to try the following temporarily:
– deactivating all other plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the default theme to rule out any theme-specific problems
Thanks for the answer.
Unfortunately, I do not have the option of deactivating all plugins or changing the theme since the problem is on a “live” site(currently in use). I do not have this problem on our staging site. I’ve tried deactivating some plugins(e.g. the ones which are not in use on the staging site) without luck.
Right now, I solved the issue by adding a white background to the .ui-autocomplete class in the style.css of the theme.