2004 Hyundai Accent Struts

Took my car to the dealer for an oil change. The ride home was very bouncy, even over small bumps. The dealer told me that when the car was on the lift, the rear struts decompressed and when the car was lowered, the struts did not "mesh" properly. They said that this happens occasionally and that I would be responsible for the $400 plus repair cost. I have never heard of this happening. Have you?