Why in the clans list there is no rank 19 ?

Not only 19 there is ( 22, 26, 38, 39, 49, 52, 55, 59, 62, 70, 74, 76, 80, 83, 84, 85, 86, 89, 93, 95, 96, 97, 98 ) and it's not done ...

That is probably because the clan with the rank 19 has died

Dead clans get removed off of the main clan page, but not off the database in case someone wants to return the clan later on, so the spaces like that appear.

I always thought it was because clans went too inactive, this makes sense, because there thread is still there, so the clan is still possibly out there in some way, the way the system works.