Bests & Worsts Reviews from Amazon

I really hate to leave a bad review but I've had this scale for a month now and whenever I weigh myself, once a week, I have to keep moving the scale around to a different spot on the floor in an attempt to get the same number at least twice in a row. I move it, tap it to bring it back to "0.00 lbs" and step on again but the number keeps fluctuating and sometimes by more than a couple of pounds. For example, this morning it showed 144.6...then 138.9..then 144...then 145...then back to 144.6 and then it changed again. I weighed myself at least 10 times (just to see) and the same number did not come up more than twice. I will happy to edit my review to give the scale a higher rating when it starts to give me consistent readings that I can count on as most other reviewers say it does which is why I purchased this one. I do Weight Watchers so a fairly accurate reading is really important for me. Am I doing something wrong? My floors are level by the way.