We did some tests and it seems the comment thread hasn't reached its limit and is still working :(
One of the mods suggests that, if you're commenting on a phone or tablet, it might be worth trying on a PC as mobile deviantART is quite buggy..
Otherwise, have you tried commenting just anything as a reply? I'm wondering if copy-pasting from the doc is causing some weird problem.
If you can type just the codes of your first and second choice genos (eg, A-36 and C-112) I'd accept that.
Otherwise, I might have another idea <3