Spam header flag remains yes even if not junk

[norricorp]

My email provider uses roundcube for webmail. They also have very poor filtering for junk so I do find wanted emails in my junk folder.
I set these to "not junk" and they are moved to the inbox. So far, so good.
My email client is emclient and when I download email, the no longer junk emails are put in the junk folder. Looking at the headers, the x-spam attribute is set to yes.
When the email is moved from junk to Inbox via webmail, shouldn't the header be set to no or removed?

[SKaero]

Roundcube doesn't change the mail headers when the email is moved to the inbox.