Tab quantity limitations on a Nomad in a multicell display

I have a display window on my nomad that's divided into four quadrants. When I start adding tabs to one of the quadrants, I get to three, and when I go to add an additional tab, it replaces the third tab with the new one instead of adding a fourth one.

Meanwhile in a different quadrant I don't have this problem, it lets me add more than 3 tabs. All four quadrants are identical in size. Is this a glitch or some kind of tab limiter?