Note: I'm just reporting this after someone else saying it on the discord, relevant message on the arma 3 discord: https://discord.com/channels/105462288051380224/108187245529268224/796403251549175868 (note that the entire conversation about the topic of the map compass, but the data overwriting is just a small part of the conversation. Apparently the overwriting can be prevented by setting the file to read only, so I'd guess the process looks something like this:

not read only:
-player changes numbers
-player boots up arma
-arma checks numbers, and overwrites them
-arma uses old numbers
-player shuts down arma
--arma saves old numbers to profile and somewhere else

read only:
-player changes numbers
-player boots up arma
-arma checks numbers, but cant overwrite them(Read only)
-arma uses new numbers
-player shuts down arma
--arma saves new numbers to profile and somewhere else