Did you see anytime different patch number when you run uname -a or freebsd-version?
It is not wrong because not all patches are applied to kernel or to userland. uname shows kernel patch.
check results of commands below:
$ freebsd-version -r (for kernel patch number)
$ freebsd-version -u (for userland patch number)
Honestly little bit confusing, but maybe because I do not understand details.