I have no idea how to answer your questions. But, two thoughts.

- I was recently discussing body fat measurements with my trainer, including the inaccuracies of all the available methods of measurement, and he told me that bod pods can measure very lean athletes as having negative body fat, which is really possible. And I've read that pod bod measurements can be affected by the amount of gas in your digestive tract. Bottom line being that a bod pod measurement might be more accurate than other methods, but it is still an approximation. So it could be that either (or both) or your measurements were a bit off.

- You say you have decreased weight training but are still exercising a lot. What kind of exercise have you substituted for the weight training? It could be that whatever you are doing now is burning more calories and building less muscle mass than your former routine, and either or both of those things is affecting your weight and body composition.