I am not at home, but I remember when you drag the first loop, the original bpm of the loop initializes the bpm of the project. You can change this bpm at project level.
Normaly for the next loops the bpm is not changed and the loops are adapted to the bpm of the project.
when the program is running, type "y" on your keyboard. click on "Import" and see if the "automatically adjust samples to BPM" is checked or not. hope this helps