Masking shows when I scroll up

I have an issue with trying to keep a mask shape inside its frame at all times.

Here is an example = https://www.figma.com/file/3PTIyRGRkuHbmjNJwJhj5o/Untitled?node-id=0%3A1

When I go to “PRESENT” mode, i shouldn’t be able to scroll above the navbar, but it does.

How can I fix this?

Your “COPY & PASTE ME” layer has vertical scrolling on it and the mask group is sticking out of that layer. You can fix it by removing vertical scrolling on the “COPY & PASTE ME” layer and turn on vertical scrolling on the “MASTER” layer.

Thank you!!!
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