Perhaps you have some cells merged or something like that?

Have you tried left clicking on the sheet in the spot kitty corner to 1 and
A to select the whole sheet and then format cells unhide rows?

"Wanna Learn" wrote:

Hello
This only happens in one worksheet. I hid rows and cannot unhide them I
tried unhide rows, edit go to format row unhide, I even tried ungroup rows
and nothing works what did I miss? thanks