My drum track is not in sync with my bass track

[357mag]

Just finished making a drum track for a Scorpions song. I used EZ Drummer for that. I used Guitar Pro to make the bass track.

But even though when the song starts everything sounds like it's lining up, as time goes by I can hear things are not in sync.

It sounds right around bar 4 or 5 things go out of sync and the drum track ends before the bass track does.

Where did I go wrong?

I enclosed a screenshot.

[357mag]

Problem is solved. The tempo of the bass track was not made at the correct tempo. It was a little off.