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.

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