Sense and Sense Ability - S5-E20
Continuity mistake: When Phoebe loses her hearing during her meeting at the newspaper, she holds her hand up to her ear while talking to Elise. In the next shot, her arm is suddenly resting on the tabletop, with no time for her to have moved it. (00:12:45)
Sense and Sense Ability - S5-E20
Continuity mistake: During the meeting with Phoebe's boss (regarding her newspaper column), when Phoebe's hearing is "stolen", the white handbag flips over (top faces Phoebe, then bottom) and upside-down (note flap/clasp) on the desk between shots.
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.