Add source/format file to Debian packaging files
You should have a debian/source/format file in your Debian packaging. This file should read
This is now the standard Debian format. If you don't have that, the Debian build system will assume that format 1 is in use, and strange and undesirable things will happen. If you check any current Debian packaging, you will see that this format is universally used.
If you want me to set up a pull request, let me know, but it is a pretty trivial change.