Matrix Row Heights keep changing to wrap when it doesn't need to do so

For some unknown reason, the row height on some of my matrices (matrix) keeps increasing to double what it should be.  I've checked all variables, and there's no need for the text to wrap.  When I click on any part of the matrix, it reformats back to the correct row height (which should be 1 row).  It seems to be reformatting as wrap text when I first log into service, although there is no reason for it to wrap text because there is plenty of space.  Anyone else experiencing this?  Any thoughts or suggestions would be much appreciated.

Thanks,

Jeremy