80% of the support requests we get are a result of Warping issues in Ableton.
If you're tracks sound out-of-sync, distorted or wacky - the issue is probably Warping.
Please make sure you turn OFF "Auto-Warp Long Samples".
Do this by:
1.) Open Ableton Preferences
2.) Click the "Record / Warp / Launch" tab
3.) Turn off the setting "Auto Warp Long Samples"
Try re-importing your tracks. This will fix most issues.