converter works not well

[wangboioz]

After I generate the index file (and convert it to index.new with the provided script), the lines representing the migration path are "fixed". What I mean is that they are present from time 0 to the end of the considered time period.
additionally, the "lines layer" is not present in the toggle layer visibility menu.
Thank you for any help you could provide me
@terrycojones
index.zip