I went through about 2 months of the same thing! I don't sweat alot generally, unless I'm exerting a fair bit of effort, but for weeks I would sweat buckets and buckets more than usual. Now, when its hotter out and I'd expect to be sweating more, I'm back to normal - not that much.
The other thing I've noticed since switching to Primal is that even when I'm sweaty and soaked, I don't stink like I used to. I mean, if I sit around and don't shower I'll stink, but on the whole I just don't.
So, I have no idea why, but for me switching to Primal did something to how I sweat for a while too.