Strange Effect on Animation Balls

I have never seen this before and frankly it worries me. My home usually gets 70+ visitors, who make use of the many animation balls. Yesterday someone wearing a certain type of attachment went on to one of the balls and it started to move away from its spot. (attachment not mentioned so others would not try this) It ended up about 5 meters away. She did this to two other sets of balls. All three sets were made by different creators. When I tried to replace them into their original spots, they would move away. I have tried transferring them and unlinking. Nothing seems to work. I dont know if this is a common problem but any help would be appreciated. Thank You

One of the creators was very kind and replaced my defective set. He noticed the physics button was checked. I found that to be the case on the other sets as well. So somehow that attachment changed that setting. Once the physics was unchecked, balls worked perfectly.