Why are bees constantly hovering over an area in my garden?

[Dualipa]

They are pollinating our lovely flowers which is great but there a couple that's almost rooted to the spot which is randomly above the grass with nothing near it. They just hover there all day and have done for a couple of weeks now.
Why is this?

Nest?

We get the same thing, there is a bees nest under our lawn and has been each summer for a few years. We've never been stung, they just come and go and do their own thing - usually flying from the nest to their favoured plants and back again.

If they are hovering they are probably Hoverflies. We get them all the time. Sometimes they hover over your head but they are harmless. They look like a cross between and bee and a wasp. They just pollenate flowers.

Should have said, Google gives a better description.

Bees can't hover, they always mimble about, so if they're properly hovering they're not bees.