Default wordpress RSS feed issues

feedvalidator.org is a bit out of date, use https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fcoolfortheblind.dk%2Fblog%2Ffeed%2F instead.

With that said, your main problem is at line 555: https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fcoolfortheblind.dk%2Fblog%2Ffeed%2F#l555

Style tags shouldn’t be injected into feeds.

Try deactivating all plugins. If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, try switching to the Twenty Sixteen theme to rule-out a theme-specific issue (theme functions can interfere like plugins).

Hi James!

Thank you so much for your respons.
The alternative to the validator was very great, I will save it. It looks like it will be updated more than feedvalidator.org.
I found out that two plugins gave me issues, so I am looking at it right now.
Thank you again for your help. You saved me many ours of work and frustration.
Best regards Thomas

You’re welcome!