Ok,

If you check the dns inside mmc do you still see the dkim record? (maybe inside some folder etc) can you manually delete it through mmc?

Yes there is no problem deleting through mmc.

But know any domain that I do a dns change through solidcp shows double entry of all records. I thought it was just one domain. As long as I do not change anything in the dns record of a domain there is only one entry.

This will be relatively difficult to solve without taking a look personally.

However in general this would most likely be an issue in the Domain database table or optionally dns template (more rare).

Would it be possible to purchase an hour paid support?

purchased support ticket.

I have sent you an email earlier for connections details.