Grease seal aluminum insert rings.
These rings can vary in thickness as well as the bearing seat depth in the wheel halve. If the nuts were ever matched perfectly to the axle hole, you could have disturbeb it by mixing components in the bearing replacement. Thickness matters.
RV-3B flying w/ carb / Pmags / Catto 2b / Steam
RV-4 fastback w/ Superior XP360/AFP/G3X/CPI/Catto3b