ofc. thats because there are not enough teams to complete the CL of one level + than you, and lower level teams were added.

If a CL, needs 32 teams to have 8 groups of level 15 CL, but only exist for example 25 teams of level 15, the game will add 9 teams of level 14... never create Bot teams to complete the places. U understand what I wanna say?