It could be double grouping but your descriptions not clear. Usually you fire 1 shot the next goes somewhere else and the third goes back near the first. A fourth ends up next to the second one so you get two groups hence the name.
Its caused by the action shifting between two rest points under recoil and is due to loose action screws or bedding. If the shots keep constantly walking with no aparrent pattern then its either a scope internal issue, possibly but unlikely the bases or the supressor unscrewing and changing the barrels harmonic
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