Continuity mistake: When Anling unmasks Yenlo, Yenlo's left hand is covering his wound. In the next shot, his hand is down by his side. (00:03:50)
Continuity mistake: After Phoebe and Paige have switched bodies and Phoebe is trying to teach Paige how to levitate, Phoebe's hair switches from her shoulder to her back then to her shoulder again. (00:20:15)
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.