PGP problem with inbox

i have been using pgp for a few days without any problems.
Since today all mails that I send are sent twice.
I have now sent myself a few test emails and it is only once in the outbox, but twice in the inbox with the same time sent?
I generated a new key pair again, but the same problem.
Any ideas ?
I am using EMClient 8.2.1237 with a free license
Thanks for the help
best regards