You cannot get rid of it IF it was part of the "CUT".PS: what do you have to do to get rid of the damn underlining when you cut-n-paste a news article?
look at the beginning of the "Cut & Paste" while your in the Edit your post mode. If you see these code figures........at Begginning > [ U] [/U ]< at end......Remove em. If ya don't see them......There is nothing you can do.