Heh - I’m calling that “Numerical Sequence Dyslexia” for lack of a better term. I’ve got it, for sure!!! My brain just goes into a spin - “Is that patch 30 going to patch 29 or to patch 31???” It is not difficult math, but it may be a “which came first” problem built into my internal wiring. Once I step my brain through it, I can figure it out, but it always triggers a “Now, wait a minute” moment. Gah! Silly brains!