Gained 5 lbs but my measurements are the same?

So over the past 3 months or so the scale tells me that I've gained about 5-6 pounds. However, my bust/waist/hip/thigh measurements have all stayed the same. How is this even possible? Where is the weight going?

The only difference is that I got a job where I was standing most of the day (cashier), and walking more than usual to and from work. At first I was working about 40 hours a week but in the last month I've gone part-time on that job. I still eat the same amount as I did before.
Gained 5 lbs but my measurements are the same?
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