Firing the Scale...Help Wanted!

This is my 3rd week on Keto.  Friday, I got on the scale and was weight 183, down 11 lbs. Then, Saturday morning I am weight 188.5. What the.....I was so upset with the scale. I have decided to replace it with a new scale. LOL. Friday was the results of 16:8 fast on Thursday. I was so hungry next morning, so I started off with the bulletproof coffee and made sure I stayed with in my macro. I even 180 oz of water. I am not sure what's going on.