Despite I allowed the user to register a multilple times to the same activities, it is not possible to register several personns with different name and surname but same email to an activity.
I checked on the settings and the checkbox “activate the limitation of multiple registration” is unchecked.
Can you confirm what happens after you try and submit a second sign-up with the same email? Default behavior is a message should appear above the sign-up form asking them to confirm “You have already signed up for this task. Do you want to sign up again?” I suspect there may be a theme or other type of conflict that is suppressing this message. Can you provide a url where this is occurring so I can test on your site?
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If you can also confirm what version of the plugin you are running that would be helpful. Thanks!
I ran a test on the link you provided and did not notice a message after trying to submit the second registration as you mentioned in your previous message. Please go ahead and remove my two test sign-ups which I submitted using an email ending in @fetchdesigns.com. I will dig in and see if I can reproduce using your same theme. If not, I may need to request more access to your system to try and debug.
In the meantime, can you provide your System Information in a private reply. You can find it in the admin under Sign-up Sheets > Help… it will be the content of the big black box.
I confirmed that this appears to be a conflict with your theme. I was able to reproduce the issue with our standard confirmation message not appearing on a second signup when using the theme you have installed. I’ll debug the issue and will let you know when I have a fix for the conflict.