Fighter's Pull-up Program with 15RM?

So I started the FPP 6 days ago (today is/was my rest day) and at the time I believed I had a max of 10 pull ups. Once I had done 12 but I figured that was occasional. I decided to jump up on the bar and rep to failure to see how far I’d progressed and I ended up cranking out 15 pull ups with me hands a little bit outside shoulder width.

Should I restart the program but for a 15rm? Any help is appreciated.

edit: just did 8 l sit pull ups and a few days ago I could barely do 1. Is something wrong here? I have no idea where this strength came from.