Hidden loop point in a seq?

Hi,
i would need a little help cut I've never had a problem like this in the past 7 months. I have a 16 bar seq, I created 24 bar from it. But it cannot be played to bar 24. Its being restarted after bar 16.
I tried to find where can be a hidden loop information in a seq or track without success. Any ideas?
Thx

highlight the SEQ LOOP field (where it says ON, in the upper right of the MAIN screen) then hit WINDOW and set the sequence to play all through the END.

it was strange that only this seq's loop was not set automatically to the last one after copying some bars.
thank you.