I have the same issue both on my production system and development system.
It's been happening for a few years now off and on. I believe that it's a browser issue that is affecting the current page session, although it seems to happen in Chrome, IE, Edge & Firefox it all points to the WHD doing something strange.
I have a support call with Solarwinds at the moment, but it's difficult to debug and simulate. I will suggest that you open a support call, and send them a Health Check log and WHD Log, maybe there is something in there which they can see why it's happening.
I'm currently running 12.5.1 and I've also tried 12.5.2 with the same issue.
The only temporary suggestion is to go to the Tech setting and disable Enable UI Enhancements, to see if that helps. Some of my techs say that helps, but I'm not so sure. This might have other affects in the web interface, so be warned.
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This is an issue with Web Objects and is being reworked by the Development Team.