Irrelevant radio based on playlist

[zerkms]

When I start the radio based on my Loved tracks - Last.fm playlist - I only get 99% of classical, while in the original playlist it's barely 30% of classical.

Why is it happening?

PS: as a temporary solution I've created another playlist with all classics removed, which in fact was only 20 tracks of 131. :-S (but it's a terrible solution)