Website Automatically Reseting

Hello Experts,

I have created a demo website just for educational purpose. A strange problem I have been noticing since one week.
Link to the demo website: https://retailshopprs.wixsite.com/website
Problem :
I had created my custom sets of collections which works with Wix Store. With these collections I had created dynamic pages. Now everything(collections, custom codes, dynamic pages etc.) is lost after opening the website in the editor for a small time gap.
Here is the screenshot of the editor and website:


If you see the page menus, extra pages are gone.
What is happening? Can any one explain?

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Thank you Yisrael for guiding.