It is annoying, but then you did lose 7lbs the week before.
There are lots of reasons why our weight fluctuates from week to week - last week I lost 1.75 lbs (I weigh in Kgs, so that's the nearest) but if weigh day had been a day or two earlier I would have been more like 3, but with weigh day came the time of the month, so I gained a bit and the loss was 1.75. I am only half way through this week, and I have already lost about 2 lbs, because the weigh in last weekend was a "false" loss and should have been more, so it will right itself this week.
By the same reasoning there might have been a reason why you weighed especially low last week, which gave you a great loss last week, but you then had an upward battle to lose this week? Am I explaining this very well??
Overall you have averaged 6.5 pounds over the past two weeks, which shows you are well on track.
I know we all want to see a drop week in and week out, but when we have fised weigh-ins sometimes it just doesn't work like that. As long as there is an overall trend in a downwards direction, you are doing fine.