Battlegrounds tries to match players within the same VT tier, but on rare occasions (maybe because it is having trouble finding a match quickly enough) it expands its search to look for players in adjacent tiers. It has happened to me maybe a half dozen times in all my time playing BG, and others have seen it occasionally as well.
It can happen, it does happen, but it should be rare.
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It can happen, it does happen, but it should be rare.