Tab Order

I’ve used Smart Forms for years with no problems, however today I have a big problem. I have a long form with many required fields, and the tab order is way off. It does the first few fields properly and then goes to the end (which is a signature field) bypassing many fields (all required). Granted, you can scroll up and do the missing fields, but any tab sends you right back to the end. Is there a way to set tab order or what happened??

Thanks,
Tina