Email field is not working well during registration... and problem with editing in backend

Hello,

I have a problem with the email field...
it seems not to work good :
- error message during registration : https://www.screencast.com/t/kDtb1PpPmV
- in backend, impossible to access to the field : https://screencast.com/t/BljMhp9J

if it can help, one more info : you can see below that CleanTalk plugin is working good and confirm that users have tried to register
https://www.screencast.com/t/ZbPYxYgx
(i have test the registration without CleanTalk plugin just in case the plugin cause the error but no, it was the same issue)


NOTICE :
i have the same backend problem for any type of field in any type of workflow field editing (user, event, groups...)

hope you can help
Loïc