Different readings on different scales?!

Hi guys,

This is really stressing me out, as over the past 5 weeks I've worked fairly hard and have been tracking my weight on my home scale every monday morning. According to my home scale 5 weeks ago I was 14stone 7lbs, I wrote down my weight each week which was as follows:

Start: 14stone 7lbs

End of Week One: 14stone 1lb
End of Week Two: 13stone 7lbs
End of Week Three: 13stone 5lbs
End of Weeks Four: 13stone 1lb

So as you can see, there is a gradual decrease in weight, although the first week or two saw a lot more of a loss, but of course as the weeks go on, you start to lose a more sensible amount which usually stays consistent.

So, my problem is, today I weighed myself on the scales at the gym...... instead of reading 13stone 1lb which after five weeks my home scale read... it said I was 14stone 3lbs!!!!!! I was gutted. I have no idea what to believe now, i've been feeling so good about myself that I have managed to lose over a stone..but which is right?? I never move my home scale, and it reads the same if i weigh myself twice to check the first reading. However, today i moved my scale to a different part of the floor and it read 14stone. I moved it back, and it read the 13stone 1lb again....... HELP ME GUYS!!!!