Woman brings home unwanted cat that's 'not all there'

[erronis]

2. I've had cats with that type of personality - and hard to read.

The first thing I'd do is make sure a good vet checks him out thoroughly. A lot of cats may vocalize if they have something wrong internally.

That side-of-mouth chewing is, I think, a way of them expressing their salivary glands, or it could be irritated gums.

Kudos to the adoptive mom!