Region dropdown - submenu selection problem

I have two regions butting up to one another vertically with the top one about 50 pixels high. I can see the 4 x options when I click the down arrow on the region size but when I move the mouse down to select one of the options it sees there is another region (underneath the drop-down) and switches to that. I cannot alter the options (or select any of the sub-menus) on the top region.

Should say this is in Firefox 45x. In Chrome it appears to work OK but I normally use FF.

Thought I would manually play around via the DB itself but cannot work out which table the region options are stored in to manually change the width (in this case).

Does anyone have any ideas how to solve the overlap/selection issue or which table I need to look at in the DB?

Thanks - John

What CMS version do you have?
It was a problem some time ago, but now it should be fine.

hmm I see, so perhaps change the region dimensions in chrome?

Or just move your region change the dimensions and move it back to it’s place?

I am using 1.7.6

And of course I could, and did, fix in Chrome.

Just a strange thing that works OK in one browser but not another. Not end of the world but was hoping to find a database schema somewhere.

Thanks - John