Invisible/ Intangible last two measures of my song

My song does not show the last two sections of my song. I was in the midst of writing it when I had to switch devices when I noticed that those parts were glitched out. They’re still there; I can hear them if I play the song and I can see them if I open the URL to my song–however I can’t edit them or even add any new measures in an attempt to recreate it. I tried numerous ways to bring it back, but the error seems to be with Hookpad+ itself. If there’s anyway you could fix this I would be highly appreciative.