I've compiled a report explaining a bug I've found with SHO's game timer for Genesis and MAME Arcade. You can find the report including video proof explaining this, in this document:

https://docs.google.com/document/d/1nacQxW7NjZH69N_BUHT3QWxEFGUY7RqAtx3-WWDVeu4/edit?usp=sharing

Please note this is NOT based on different frame rates and is a bug in the program itself. Jesse, I added you on Discord so if you need to discuss anywhere, let me know.