Hi Michael, by chance I realised that you have created a repository named gcsa to package gcsa2. The fact that d/control advertises the Vcs URLs as gcsa2 convinced me that it would be sensible to rename the repository which I just did (please adapt your local clone).
As a general note to avoid this kind of issues (where the repository is different than the source package name) I can only repeat my advertisement of https://salsa.debian.org/med-team/community/helper-scripts/blob/master/inject-into-salsa-git Just use it, please. It prevents everybody from manual work and it does things right (provided you set Vcs-Fields correctly). If you have questions how to use or if you might find a problem please talk to me. Enjoy Andreas. -- http://fam-tille.de