GTM DNSSEC module and dotgov domains

I can only tell you what the support person at the .gov register told us when we inquired into why we are getting Could not validate DNSKey/DS errors when we try to enter either a DS key data and DNSKEY data into their web site taken from the F5 GTM. We have three DNSKEY records that are returned when I query the zone all with corresponding RRSIG records in our domain so it looks like everything is in order to me.

I have asked the dotgov register for more clarification on this requirement as I agree it's odd that I'm the first person who has experienced this.