Clickable Objects In Window Mode Are Offset

When I load bluguide or nostrum and try to click on elements on screen it seems that the position is offset. For example the mouse needs to be much further above the object then it should.

If I switch to fullscreen borderless or fullscreen mode then there are no issues at all.

Is this something that's reported back from the windower API's or is this just something in the lua that could be corrected with some reprogramming? I haven't taken a deep look but figure someone may have encountered this who spent a bit of time on it.