Excel keeps hiding some of my rows
 

I'm finding that Excel keeps hiding rows beneath others, laving a gap in the row numbers (e.g.. jumping from showing row 83 to 89) I can get the rows back by dragging down on the row number below. Despite retrieving the hidden rows the problem repeats itself.

SORTED IT ! The file was adapted from one originally created by a colleague - there was a filter on a column which I don't use.