Turns out they ran out of broth and were closing for the night.
I was slightly irked by it, could they have not anticipated and made a little more broth? That's 2 hours of revenue lost (they close at 10pm btw.)
My party of 6 ended up going to Kinton instead. Got there at 8:30pm, seated by 8:50pm. Guess going late pays off at Kinton. No epic 60-90 minutes wait!