What's Up with Electron Apps?

There are a number of desktop apps (Chromium, Signal Desktop, Mattermost) in the last couple of monts that when they are displayed on my laptop screen with 85% scale-down resolution, begin to act very funny. Clicking in the app, makes them smaller, clicking on something highlights something else not tooo far away. On my external monitor (100% scaling) there is no issue. Clearly there is something amiss with how Electron and KDE on Wayland are playing together.

f41 electron chromium #mattermost signal