An UD after a DD will easily add a pound, because you are replacing gut content and also glycogen you used up on DD, which carries water with it. But a second UD should not usually add another pound.
Remember, UD's are about eating normally WITHOUT OVEREATING. Eat until nicely satisfied, but not stuffed, as a rule. Choosing healthy foods is preferable. Small treats and occasional blowouts on UD's are fine, but if you eat big every UD, you can outeat the DD. Think about it..... If every UD added a pound, then someone just eating normally (i.e. every day an UD) would gain a pound a day until they blew up. It doesn't happen.
The idea of JUDDD is be strict on the DD and relax on the UD... But that does rely on the UD not being completely wild. Or, to put it another way: if the way you normally eat results in ongoing weight gain, you probably need to change the way you normally eat. That's what I had to do, and so far, that's really all I've done, and I've lost six stone.
Also be aware that you do not have a massive amount of weight to lose (it might feel a lot to you, but trust me, it's not) - so unless you are able to exercise like a fiend, you won't be able to lose the weight quickly. Ye canna change the laws of physics, Jim. A loss of half to one pound a week, on average, is a reasonable goal. But given that weight varies by several pounds over the course of the day, even more so when fasting, it would be easy to lose sight of the loss within the normal variation. Try comparing your weight on Fridays with your weight 4 Fridays ago - you should be seeing a loss each time, even if you don't always see one from last week.
Hope something in that lot helps - if not, ignore it.
Barbara