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Judge Mathis says he has no hard feelings after going back and forth with 50 Cent earlier this month ... but he's still going forward with his own "BMF" project regardless!!!

TMZ Hip Hop caught up with hizzoner at LAX, where he explained he and 50 haven't spoken since their social media disagreement over Mathis' upcoming biopic, "The First Lady of BMF: The Tonesa Welch Story."

50 cent

The TV judge is executive producing the film and 50's ex, Vivica A. Fox, is the director ... but 50 was more concerned with Tonesa being labeled a "BMF associate," because he says her ties are more with Detroit's 263 Crew ... a gang that preceded BMF.

Regardless of what the title says, JM tells us he's a proud Detroit native looking to get Tonesa's story out in the open, which will debut on BET+ later this year.

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