Assuming you haven't got frags elsewhere(seeing as you have some extra frag on some, it's unlikely), that's 18 rares. Given the average rate, that's 1080 total pulls.

That would put you in but not above ultra rare zone so it is normal.

Free pull counts

for both rares and super rares.

Which means it was included in my 1080 estimation. Of course, my calculation is only an estimation of what you have done based on the ninja (and frag thereof) that you have, you might have a more accurate number somewhere.