received email subject appears as without subject

[daxeroxa]

hi

I have a problem with some accounts and some emails, when I receive an email from the inbox, the subject is displayed correctly, but when I open the mail, the subject appears as an issue and the content of the mail is blank.
The problem is erratic
Thank you very much for your support.

[JohnDoh]

is there anything in the roundcube error log?