Made a form in which colleagues can add revisions(+1 row) and amendments (1a,b,c). Once filled in, and opened again the amendments disappear. Anyone who can help?

Hi everyone,

See picture below. Part of a large form I made for work. Got a little problem though. Adding a new row with the button 'add a new revision' is working perfect (also when saved and reopened). But when I add amendments with the + button on the right (a,b,c), these disappear when I save and reopen the file. Anyone who can help?

Thanks!