Its a different powder I know but I've had similar experience with Swiss powder down here. I'm usually working with 1.5 or 2f and they both 'clump up' on occasion. Not quite to the extent you have in that photo though. It breaks up easily enough and doesn't appear to effect performance. Would like to try some more of that O.E. but it doesn't look like anyone is interested in picking up the Goex agency down here. Even Swiss...is top dollar and few and far between. From memory I had more experience with clumping with the 2f and 3f... and no so much with the larger granulation. Our powders are often several years old by the time we seem them too. Only recently finished a bottle from 2011 which I purchased in 2013.

Perhaps 'time on the shelf' doesn't help either.
Gavin.