Playlist, mixeditor issue

Rookie user asks again, good morning for all.

Last night I made playlist and I tried to use mix editor
( I choose 3 files active song - jingle - song, pressed right button and choose mix editor selection )
After I did my mixing ready on mixing editor, I repeated that for next 3 songs too.
When I tried to play it those played very fast, first song was more than 3 min long, it ended faster than 10 sec and then jingle started to play, first song was still playing on back ground, and after jingle eded, second song started to play even frist song was still playing.

What did I do wrong? Did I missed some remarks from songs or what?

Sorry explanation is not the greatest, I hope you understand what I mean, if no - I need to do video about it?