As MISSHEATHER77 said, she has been here a while. She knows the drill. Repeating the basics is like preaching to the choir.
Her frustration is coming from the precise nature of the numbers. It's not 2 pounds, then 5 pounds, then back to 2 pounds.It's five up, five down, five up, and then five down. It's numerically strange and frustrating!
Sorry Miss Heather. My scale does very similar things to me. It makes me suspect that my scale is trying to drive me crazy, so I'll be sent away, and it can steal all my stuff and move to the Bahamas.