Why do some Im's have a higher ELO than Gm's

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Jrmyp

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BobbyGotFischered
If you mean online it could be for a lot of reasons:
Classical performance dosen’t translate to blitz/bullet
Some people just play online more
The GM may be older and past their peak
The IM may be GM level or close but hasn’t ticked off all the boxes yet to get their title