I'm trying to create a SRV record, but the editor keep appending my domain name to the end of "redirect to" as the output.

Is this a bug, because as far as I know, this shouldn't be the case.
See attached images:

https://imgur.com/a/oChQW

In the above case, the domain that gets appended is siko.dk the value - how do I remove that?

Thanks in advance.