Hello,

This is due to an old bug in older version of iCagenda.
The issue was when deleting a user registration, the custom fields were not deleted.
To fix it today, you have to selected trashed custom fields and empty trash.
If you don't have custom fields in trash box, just create a new custom field, then add it to trash. Select it, and empty trash.

This process will check the database, and will clean your custom fields data

If you have already empty custom fields trash between your first post, and last message, that means you have already fix the bug

Best Regards,
Cyril

Hello,

Do you have followed my instructions above in my previous message ?

Cyril

Is it possible to send me a super user access at this email info(at)joomlic.com ?

MrBG wrote: Sry, that's not possible.

Ok.... it will be difficult...

The issue is only with custom fields.
That means some custom fields data exist in the database table (#__icagenda_customfields_data) for a registration that doesn't exist anymore or to an event which doesn't exist anymore.

But, could you give me more info about the custom fields that should not appear ?
Does those custom fields exist today ?
Are they custom fields for event or registration ?

BUT.. the issue was fixed in 3.5.6, unfortunately, i realize you are on 3.5.8 ?
Could you upgrade to latest version 3.5.9, due to a bug in trashing for registrations in 3.5.7 and 3.5.8.
And then, try again to create a custom field for registration. and then trash it and go to trash to select it, and click on empty trash.

...

Difficult to help more...
But first, it's better to update to be sure you have the latest version

Regards,
Cyril