This may not be what is happening to you but telling how it is happens to me. In your situation occuring in a single area is suspicious though.
In my days when I used to do Field Archery I found that I had 2 master eyes. Most people don't have this condition. Generally in astronomy people can use their master eye to observe through an eyepiece while still have the other one open and still able to see.
Mine fight each other to dominate the view, so I have to close one eye all the time. It is weird but I see stars moving all the time and was told the shift between the 2 eyes causes this problems. I have to sit and try to concentrate to stop the stars from moving. It is such a weird feeling to see 2 stars remain stationary while another zooms around Drunk as a skunk.
I know it is something to do with my eyes as I can stop it from happening when I close one of them and it happens so often about 5 or more times per minute.