Hide/unhide rows checkbox hide but doesn't unhide

So I want to have rows hidden, and only show them if a checkbox is clicked.

All I find searching all say the same thing, EntireRow.Hidden = True/False is what give this effect, so:

Sub CheckBox1_Click()
If CheckBox1 = False Then
    [10:15].EntireRow.Hidden = True
Else
     [10:15].EntireRow.Hidden = False
End If
End Sub

Hide works like a charm. But it never stops unhiding.
Google doesn't help me figure out the reason, can you?