Do a set up check
First off, I have never found the need to offset the fence from parallel to the miter slots in 50 years of woodworking. Use a splitter if you have one. This helps keep the workpiece registered to the fence after the blade has made it's initial cut or kerf.
Second, set the blade and trunnions parallel to the miter slot, if it's not already so. This is an advanced operation for someone who has never done it, but certainly doable. Instructions are in the manual, online and on You Tube. Contractor type saws have trunnions bolted to the bottom of the table. Cabinet type saws have the trunnions bolted to the cabinet. Depending on which type of saw, you will unloosen 3 of the 4 bolts and shift the trunnions, recheck for parallel, tighten and then recheck again.
Finally, remount the blade cleaning off all mating surfaces on the arbor, washers and blade itself. If the saw marks are coming from the rear of the blade, most likely the fence offset is the issue.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 04-08-2018 at 10:02 AM.