Both my DS's get teeth in bunches.
Most recently, DS2 popped 4 teeth between Christmas and new years and has 2 more since. First were the bottom two, then the upper right central incisor then the upper right lateral and most recently the upper left two.
But for a week there, he had a lopsided smile.
I wouldn't worry about the order they come in, they all poke through eventually!
DS1 didn't follow the charts too well with the majority of his. The only ones that have been on schedule and in order are his 2yr molars.
DH and I - totally winging life with our four children, DS1 (6.5yrs), DS2 (5yrs), DD (3yrs) and DS3 (1)!