Asking about Blender function

Sometimes i suddenly got this annoying thing. As you can see in the picture, there is a ring cover 1 object and this is kind of link every objects in this ring.When i move 1, another moves also. I have no idea how come i got this, and how can i deactivate it. pls help me :slight_smile:

This is proportional editing. Toggle on/off with shortcut O

thank you very much :slight_smile: