I suspect that sometimes the person who uses the acronym doesn't know its meaning. Or the acronym doesn't even have a commonly accepted definition, even. For example, that's my experience from recently reading a number of articles on the "OSR" scene, or movement, or trend, in TTRPGs where "OSR" is variously explained as "Old School Revival" or "Old School Rennaissance" or even "Old School Rules", etc, but without any agreed-upon definition of what the hell it is.
(Btw: TTRPGs = Table-Top RolePlaying Games :P)