Just a guess......
6000 would be the 10 sec mark. The overlap is 1 sec long.
Assuming the 2 sec initial gap, and an 8 sec warning, that puts us at the data track.
Did you set the pregap for the data track to 00:03:00 (ie, 3 seconds).
Don't forget, you have to adjust the other tracks after that, too, so the times are right.
But that's just my guess....