I'm capturing these objects on my security camera and they are leaving landing areas.

I just got my Geiger counter in the mail today because I have been curious about these strange things I have been seeing that have also left strange marks in my backyard. I have been observing strange indentations in my backyard over the last year. There have been many indentations left in the yard and one in particular has left a reading of 113 V/m and .13 uT on my Geiger counter, which is, supposed to be an extremely dangerous level and concerning amount for an electromagnetic field. The indentation was left on a fence that divides my yard and the neighbors behind me. It was enough weight to bend the fence and nothing has fallen on the fence. Nobody has been in our yard doing work, but whatever it was, it bent the fence and left about a 4 ft. wide across indentation on the fence and in the brush against the fence. I haven't contacted anyone yet because I don't know what to do. There are also seems to be small footprints left leading away from the indentation that has left readings that can be picked up by my Geiger counter.