I agree with what Lepus said about them being a shadow or dark being. Definitely considering that both you and your husband have seen them at different hours, and it's good to pay attention to their form, and how they appear to make themselves be known.
And when that both you and your husband saw it, tho you didn't mention if he felt the same feeling when it was present, and I think that feeling could be what they want to invoke into other's. So I think it's good to pay attention to the feeling when those beings are around as a way to recognize their intentions.
It's good to hear that you haven't felt the same weird vibe that frightened you at the time.
