Odd display behavior for Custom FIelds

To list,

I just noticed that in rt 3.8.7, the Custom Fields displayed will stretch
beyond the borders of my “window” if the window is too small for the display
of all my fields. If I drag the edge of the window out to make it larger, it
looks OK, but if I drag it back to a smaller size, the drop down CF line
stretches out beyond the window borders.

I do have a modification in my RT (local) code to make "Single Value"
selections become drop-downs, but that was never a problem in 3.6.4.

Any ideas?

Kenn
LBNL