I have a Makita Track saw and never had that problem. Can you post a picture, might help with the diagnosis.
I think there are a few reasons why this might be happening.Are you using dust extraction? If not you may be getting an excessive build-up of debris inside the blade guard that is binding the blade. It s important to use good dust extraction with plunge cut track saws that have enclosed blade guards.
Yeah there's no rubber strip because the blade cut right into the track itself. I think it's because I didn't tighten those two knobs to get the saw tight with the track, which introduced some lateral movement. That along with some pressure pushing the saw toward the track probably is what did this.Can you adjust the saw blade distance to the edge of the track? I don t see your rubber strip. I have both a Dewalt and a Festool system. I know that with my Festool that I can dial the distance in to the edge of the track so if you have more than one saw you can set them up to use the same track and the strips will be accurate. I m wondering if your blade might be too close to your guide rail and maybe catching it. This may what is occurring in point #1 above where you have a little play in the track. I would keep using the messed up track and practicing with some scrap wood until you get everything dialed in and your are satisfied with how it works. Once its all working throw in a new blade and pull out the new track. Dust collection is one of the thing that really sets these saws apart. It s nice to have such a clean work area. Also dust under the track will cause it to slide and move.
It sounds like you may be new to track saws. We all were once. Another common issue is you may notice a curve in the middle of your cut. Your material MUST be supported along the entire length. Cutting a sheet of plywood on a couple of sawhorses doesn t work anymore. If your material sags in the middle your cut will be bowed. What many people do is buy a 1-1/2 or 2" thick of foam insulation and put it on the ground and cut their material on top of that. I don t like to get down on my knees or bend over so I made a frame out of 2×4 s that sit on edge that sits on top of saw horses that is stiff that I use when ripping long sheets.