Grid displays strangely later in the song (Hard to place notes correctly)

[that-artist-dude]

Hey guys. I'm making a song cover in our favorite musical buggy mess, and it's a bit of a longer one, so I ran into an issue that I started noticing around the 40th measure, where the grid started snapping forward instead of following the top bar smoothly. After I saw it, I also realized it had been happening the entire time, gradually, and through testing found it became TERRIBLE near measure 90 (where the original song ends, inputting the MP3.) I worded this weirdly and can't really describe it, but it'll be easier to tell what it is with the attached images.

I am using Google Chrome.

(Look at how the lines directly next to the numbers differ from the lines on the grid)