Valhalley of the Dolls (2) - S6-E2
Continuity mistake: When Jason is escorting Phoebe into his office her left arm is down by her side in the rear view. When the shot changes to the front view, her left arm is across her stomach.
Charmed (1998)
1 mistake in Valhalley of the Dolls (2)
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Trivia: Holly Marie Combs's real life pregnancy with her son Finley Arthur Donoho was mirrored by Piper's pregnancy with Chris in this season.
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Answer: That was a mistake in the series.
Also, the episode is called 'Babies First Demon' and this alone tells us that it's Wyatt's first time in the field (so to speak) and as the sisters say, they've done a good job of clearing up their own magical messes so far. Nobody really knows how advanced Wyatt's powers are, or will become. That's why the cleaners appear, to nip things in the bud. The Cleaners didn't want to chance that the sisters could clean Wyatt's magic up, just incase they couldn't. Therefore intervening themselves, just in case.