We are facing an issue in Pega 7.1.7 only on one of our environments, only when using chrome and only when the operator has a locale starting with nl like nl_NL or nl_US. I've created SR-A20215 for it. Did anyone face this issue before? I also tried to create an activity with no method calls and no parameters but I got the same issue.
You mention that is only happening in Chrome. Have you tried using Chrome in Incognito mode, which would disable your extensions and add-ons? If not, I would try that and see if you are still seeing the overlapping happening.