Forms :: Empty Cell That Won't Go Away On A Form

(Access 2013). I deleted an old text box cell on a form and then I created a Combo Box from the design controls and it worked, but underneath it, the old label of the text box is still there, except now it's just described in the properties as an 'empty cell'. It still has the old text description showing on the form, but there is no caption field in the F4 properties.

I've tried everything I can think of to get rid of it, including closing the database and running a repair, but nothing works. I can select it, but I can't delete it or move it and I can't click into it to create a new label, hovering over it just produces the 'selected' cross hairs.