Halo reach level reset 360 legacy game

So I’ve got an issue and I’m looking for help on it I was high level in reach back in the day last time I played it and then I reloaded it up a year ago to finish my levels before the servers were shut down for good. I was around reclaimer/inheritor level the last time I played and it has bugged me that it happened I know support as for getting my level back is probably not possible but I’m honestly just curious what could have happened or what did happen

Any chance you used a different account when you played originally?

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> Any chance you used a different account when you played originally?

No this account is the same one I’ve been using since halo 3 which my level there is fine but on reach its 100% been reset I wanna say I hit hero december of 2010 and was reclaimer/inheritor just before 2014 or so. I had quit playing for a bit as no one I used to play with was on but felt I needed to get the pilot skull helmet since I was so close