Revealing mistake: At the scene of the crime, Andy enumerates the factual inconsistencies and says, "We're inside an apartment on the ground floor," except we can see from the window that the apartment is not on the ground floor. (00:06:43)
Charmed (1998)
1 mistake in Dream Sorcerer
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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.