Andy
I can't repeat that here.
I loaded a 90 bar song. No Lyrics. 1st page shows bars 1 to 68
At the end of the song, the 2nd page "scrolls backwards" so that the entire 'end part' of the song fills the screen. Mine is showing bars 29 to 92

If I open another song, it goes to bar 1

If I play the first song again to the end and select File > New it shows a blank chord chart starting at bar 1 and 36 bars in length

What are your chord sheet settings? E.g. how many bars are displayed on the 'first' chord page.

What is the length of your song (in bars)?

In Options > Preferences > Display, if auto-adjust #rows checked, and what are the values for min/max rows?

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