The line-up number you have now, if it's low, is based on your May performance. The number you may have enjoyed in May was based on 2016 performance, but that went away for the June meet.
If I remember right, you ran out of the rookie line, and won't now. There are groups of 25 called up, and it's courteous to to try to assemble in some sort of numerical order. (You can't wait forever for the guy in front of you to show up -- he may not be running at all in the June meet.)