let me guess, you are using......ohhhhh.....modio? lol
the word "Shrink" gave it away.
Modio's Rehash/Resign is "touchy" at best (a.k.a. SUCKS!! with sensitive saves)
Use Either:
Horizon to Extract/Inject (and Rehash/Resign)
or
Hash Block Calculator (to Rehash, which NEVER fails)