I was able to get past that by doing it on a desktop instead of a laptop.
I'm including the information as I go because I have yet to get any response from SS.
First one went through OK.
Second one said it failed after three tries. Then I noticed that I had two emails, one said it was pending research. It's a CMMG MK57 so there is nothing special and I included pictures of the markings. There is also a payment completed email. So I hope it just needs someone to look at it. It still shows up on the SS portal as ready to certify and certify now.
Third one, second CMMG, a MK10 this time, is also Pending Research.
Fourth one also is pending research, a Palmetto State Armory AKV.
This time I caught a the reason why and it said the manufacturer is unknown? CMMG, Inc. and Palmetto State Armory? Anyone else run into this? I included pictures of markings. Hope that helps.