Note :-- It happens in default small Touch UI dialog window, not on full dialog window.
I too checked the issue in Chrome and Mozilla and yes there is a dropdown flickering issue and not on full dialog window.
I think this is a bug. Please raise the support ticket to Day care.
Please have team expand and review the 188.8.131.52 release notes  , in particular, search for CQ-4257440 details :
Hi Tarrant County team,
We are working internally (with your CSE) to review the issue on your PROD environment -- we will be updating the related Daycare ticket accordingly. We apologize for the lack of ticket updates -- as detailed in the recent ticket update.