Unsolvable drawing

Hi all, I have a CSWA exam coming up and am having a very frustrating issue with a practice part. My friend also isn't capable of replicating this issue and i have tried closing and reopening the app and restoring all my settings but it still happens...

When I try to draw this very simple geometry, lines and shapes keep getting classified as unsolvable even though, as far as I'm aware they shouldn't. Was wondering if anyone else has had this issue or if anyone would be able to help?

Many thanks,

Craig.

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