"Book now" continue to loops

Hi

Great plug in. However I have 2 issues:

1 When “Book now” button is submitted, it changes to looping dots that continue to loop until I manually refresh page. So there is no conformation that booking is submitted. It looks like page is frozen as dots are continuously looping?

2 In reservations. “Saving Data” screen freezes when I click “Reject” and “Yes” on the pop up screen. After about 1 minute it show “504: Gateway Time-out” However booking record is moved to rejected items.

https://www.ads-software.com/plugins/booking-system/