A while ago (like last two hours before posting this) there was briefly an issue where model and article categories couldn't be selected. Its since been fixed. I'm disappointed that the default for models is still "Checkpoint".
I see creators forget to set this field for their uploaded models all the time and leaving it on "checkpoint", which causes a lot of issues. It would be so much nicer if it was defaulted to null (forcing a user to select something to progress) or LoRA (by far the most common)