I encountered this on my Dad's Meteor. It was working fine with a matched pair of 5101 SRAM and coin battery. This was an early MPU200 board with four masked ROMs. When installing NVRAM one audit would not save correctly and always revert to the same junk value. Also the spinner sound among a few other sound effects was wrong. This is the identical issue that comes up when you use two 5101s of a mismatched speed... IE a U8 is 150ns rated and U13 250ns.
The fix for my Dad's meteor was to change the MPU from four masked roms to two M2732A EPROMs the issue resolved itself. Other people have told me changing to 2732 ROMs also fixed this issue that can happen after installing NVRAM.
I think the problem relates to this
which was fixed on later boards with a blue jumper on top side and then later on the PCB was fixed (i think?).
My replacement MPU using the same FM16W08 chip is fine in meteor. It is triggered a little differently tho.