KSP Realism Overhaul (and other mods like RO Engines, RO Tanks, RealFuels) were updated, which switched the RD-170's fuels from Kerosene/LOX to RP-1/LOX. I tried using the mod after RO v16.1.0 and the tanks meant for the RD-170 do not have RP-1/LOX as an option. So, yes, just a heads up.
EDIT: Nevermind, there was a hotfix for RO that fixed this.