Hi @metacofleurcom,
On your site: https://k5ebubmz3c-staging.onrocket.site/membership-subscription/, I’ve tried exactly with the examples you’ve provided and everything worked correctly.
I first registered with the following email address: test1@domain.com, after that I hard refreshed the page (CTRL+F5) and registered with test2@domain.com without encountering any issues. I’ve also tried with test[email protected] and again I got the same results.
Since the issue you initially encountered might have been because of caching, you can try the following steps:
1. Do you use any caching plugins or caching functionalities? If so, could you please exclude our pages, the pages created with our shortcodes, especially the page where you have the PMS Register form ( [pms-register] ) from it, and check if the issue persists?
2. If you have any caching enabled via a plugin or from your hosting, please disable them temporarily and check if the issue still persists.
3. Please create a new page on your site and on this new page add only the PMS Register form ( [pms-register] )and check if the issue still persists.
Note: Also when testing this, try to test from an Incognito browser window or hard fresh your browser after each registration.