issue with transfer across monitors

Laptop - 3840 * 2160
HDMI monitor - 1920 * 1080
When I move the edit window over from the laptop to the HDMI, most of the mouse location functionality works fine (location, moving regions etc.) What does not work is just one or two locations in the sampler control window (notably loop mode). Many other buttons on that pane work fine. Transfer this window back to the laptop screen and I get access to loop mode.