There's a bug when creating dynamic pages with Wix Stores Collections for collections that contain characters: (, ), +. There may be other characters which cause this but I haven't checked.
To reproduce this issue:
1. Create a site and add Wix Stores
2. Create Wix Stores Collections called: "Broken (Oh great...)" and "Broken + Annoying".
3. Create a new dynamic page and choose Wix Stores Collections when prompted.
4. Navigate to the dynamic page and select 'Broken + Annoying' in the top right dropdown, then hit preview.
5. Oops...
If this could be fixed then that would be great as I'm doing some work for a client where I've built custom Collections pages for Wix Stores and this breaks many of the pages.