Hello, I've downloaded April Dunnam's Desk Reservation app, followed the instructions, created lists and hooked them up. There are no errors in the app. However I find that I am able to double book the desks.
Here you can see I have 3 desks booked for 21 June and that Desk 1 is booked twice.

Yet all 4 desks are still showing up on the 'select a desk' screen for that date.

I am using this filter in items

I haven't changed anything apart from the list names, which I have adjusted throughout, I so am at a bit of a loss on how to proceed.
I've downloaded it again, just in case I accidently changed something but the same thing happens.
I know this is a popular app - and lots of people have it working - so it must be something I've done.
Any help would be much appreciated. Thanks Vicki