I experience this issue occasionally, but I know how to fix it. For me, the issue is that I start MATLAB with one display configuration (say docked into a setup with 2 large monitors) but then use MATLAB in another configuration (say directly on my little laptop screen). The issues is that MATLAB does not reevaluate the display settings, and little issues like this start to crop up.
The fix is to power cycle MATLAB. When I close MATLAB and then re-open in the display environment in which I am going to work, the cursor line and column become properly displayed again. Not sure if this the same problem others are having, but this 100% fixed the problem for me.