The "INCORRECT BLOCK COUNT"shouldn't be there.
At least, I do not have these messages.
** /dev/ufsid/54ca20c41b3d50b0 (NO WRITE)
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
UNREF FILE I=2006402 OWNER=root MODE=100666
SIZE=0 MTIME=Apr 9 07:29 2018
CLEAR? no
UNREF FILE I=26324042 OWNER=root MODE=100555
SIZE=684072 MTIME=Dec 12 20:49 2017
CLEAR? no
** Phase 5 - Check Cyl groups
27679 files, 300300 used, 74373502 free (3758 frags, 9296218 blocks, 0.0% fragmentation)
Do a fsck after rebooting - use the console access, before pfSense kicks in, so fsck can do its magic.