MarketPress – Can't remove menu items & "Pending" items added constantly

Hi there!

I'm having some issues with MarketPress on this site – I can't seem to remove the store subpages from the menu. It's happening on a couple of sites I'm using MP on, and I can't understand why I'm not able to customise the menu. Is this a MP issue or a WP issue? Any light you can shed on this would be super helpful.

For some reason, the pages keep multiplying with "(pending)" status being attached to them, too.