How long has it been curing and how off was the mixture?

Way too little hardener = will remain tacky

Somewhat too little hardener = will cure, just more slowly

Too much hardener = will cure quickly

The specifics come down to the expoy in question and whether or not the maker pads their ratio one way or the other to make it easier to use.

If you're only somewhat off, I would give it time and you'll probably be OK. If you're way off, I would still give it time but would be less hopeful.