Unable to resize column in Matrix

In a report, there's a matrix which needs to have equal width columns of a certain size(around 8-10 chars long). I tried manually dragging the column borders to resize which usually works properly. But here for some column when I try to drag, it goes back to its original position(size) even when The Auto-width option is disabled. I tried using a dummy measure and even a dummy column to getting to equal size using auto-width option. but it goes back to same certain position when the actual column is added back. I'm not sure, if this is a bug. Can we find a workaround way to achieve the same?