prob with audio time

hello all

i want to make a dvd with kdenlive and get started, it's all new for me so i can make some mistake's but i have a problem i don't know how to fix
if i add the audiofile (flac) it says in the project tree the duration is 10m00s but if i play the file the duration is 2h33m49s

how can i change this. do i make an mistake or is it a bug. i am not this big linux user so please be patient

thx
kite