Nintendo Vs Castlevania - background layer jumpy?

[KLOV]

Hi all,

I have a Vs board with a reproduction Vs Castlevania daughterboard. Everything went together fine except as soon as the screen starts to scroll, the entire background/character layer jumps up and back down a few tiles' worth. The sprite layer stays nicely in place. Has anyone seen this before? I am using the modified rom for the RP2C04-0001 PPU that I had (previously on RBI Baseball).

It actually doesn't happen every single time, sometimes the board will behave for a few minutes...

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Source: https://forums.arcade-museum.com/thread ... py.534012/