Go with it as it is. The roller stayed on the tip of the valve. It will roll across to somewhere on the valve tip, sometimes it goes out, sometimes back sometimes it'll go back and forth - as lomg as it stays on the valve you are there. Since you didn't check the previous cam and its' pushrod geometry who is to say that the new setup isn't a vast improvement.
I agree 100% with Jerry, very likely the machine shop had to sink the valve a bit further into the seat so taht it can seat - we don't like to see that but the other option is new seats/replacement heads (they might make a thicker 'problem solver' valve for all i know) but if the rocker stays on the valve then it is doing its' job.