Can I have multiple DKIM records on my domain? Yes, you can publish more than one DKIM record on your domain. DKIM records will differ by the DKIM selectors in order email receivers can find the right record in DNS to authenticate emails by DKIM.
Why is the same domain listed twice in Domains Overview? The same domain appears more than one time in the Domains Overview dashboard if the DMARC policy and/or percent of the emails to apply the policy to was changed after the record publication in DNS or if the pct= tag was missing in the report.