I interviewed a candidate whose lip movements were not matching the sounds. His mouth just mumbled randomly, but a quite eloquent voice was produced, including

I interviewed a candidate whose lip movements were not matching the sounds. His mouth just mumbled randomly, but a quite eloquent voice was produced, including sounds like "th". I assumed that it was some sort of sound delay and placed the doubts on myself ("it's probably my uncouncious bias"). When he got hired, he happened to be placed in the same team as me, and I was surprised to how thick his accent was. He just stayed for less than one week, because he lied about a lot of stuff to HR as well (he wasn't even living in the country that he said he was, so there was no way to ship the equipment).