> Is something bad with my template or is this normal behavior ?
It's all fine.
If you check the dependencies of the package, you'll see:
gnupg2
libc6
zenity
A moments thought, and 2 moments checking, will tell you that most of the
packages are pulled in by zenity.
Debian provides apt-rdepends which will show you the dependency tree for
a package - useful in this sort of case.