The 270 bpm red line will be more precise at 48861 (offset) instead of 48871, you can check this by listening to snares after this red line at 25% playback rate
You have a bunch of notes unsnapped by 1 ms that you can easily fix from Timing -> Resnap all objects. Before doing this be sure to have set a snap divisor that contains every snap you used (for example you you used 1/4, 1/3 and 1/6, put it at 1/12), then you can proceed
Also why your General page is totally empty? :thinking: It should appear like this https://prnt.sc/wy2g8a maybe something wrong with your mapset verifier?