K2JB seemed to be deaf on 20m today

As I write this, Dean K2JB is still activating from W4C/WM-071.
He called on 20m a few minutes ago and put a very good signal on my receiver. I called him but he kept calling CQ. It looked like he wasn’t copying me.
I can’t understand this as his signal was 589 here while probably working QRP and a GP or wire antenna and I called him with a 3 element yagi up 15m agl and about 700 watts.
If you read this, please, get back to 20m and double check that you are not having something wrong preventing you from copying signals on such band.
I’ll wait for you just in case you read this or someone let’s you know about this.
Thank you.
73 de Guru