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:

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

Maybe the problem is with screen refresh. Give it a try:

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