Can´t delete User in CB

Dear CB-Team,

I like to delete a CB User. But I can´t do this because the associated Joomla user is missing (don´t ask me how this could be happend).
I get a white page with the sentence: "Benutzer-ID konnte nicht geladen werden" /"Can´t load User-ID"

Database fixing tools don´t work. How can I delete the user?

Thank you!
Mike

Joomla 3.6.5 (yes, I know.... update is comming soon)
CB 2.1.2

Strange things happens here:
When I logged into the frontend as superadmin and save a foreign profile, the Joomla user will be deleted. CB profile is still there. What happens there? Will made the update of the system today.

Do not manage users from Users > Manage. You need to do so from CB > User Management. If you've managed users from Users > Manage then your users are out of sync. To fix this run User Synchronization within CB > Tools.

Thank you for support.
I made all updates for Joomla and CB.

I manage all users with community builder, not with Joomla core. The issue was not directly my fault. 174 users was not listed in the Joomla user management, but they was still in the database. I checked the database and found an recurrently error: I had strange strings in "xxx_users" the column "params":
{"language":"","editor":"","timezone":"Europe\/Copenhagen","0":"{\"language\""\",\"editor\""\",\"timezone\""Europe\\\/Copenhagen\",\"0\""{\\\"language\\\"\\"\\\",\\\"editor\\\"\\"\\\",\\\"timezone\\\"\\"Europe\\\\\\\/Copenhagen\\\",\\\"0\\\"\\"{\\\\\\\"language\\\\\\\"\\\\\\"\\\\\\\",\\\\\\\"editor\\\\\\\"\\\\\\"\\\\\\\",\\\\\\\"timezone\\\\\\\"\\\\\\"\\\\\\\"}\\\"}\"}","admin_style":"","admin_language":"","helpsite":""}

I solved this with a SQL code: UPDATE `xxx_users` SET `params` = '{}'
After cleaning the params the user in Joomla core was back again.

I know, this is not an CB issue. But do you have an idea why this issue comes over and over again? Updates had no effect.

You maybe experiencing the below bug.

forge.joomlapolis.com/issues/6659

It can happen if a user updates their profile on frontend and you've disabled the userparams field, which is responsible for processing the params.

Yes, that´s the issue. Thank you!
I set the Params on "visible", now it works and the database table "params" is filled with "normal" characters. Would be great to find a solution. I like to disable the params for the users view.