Thick/Clumpy S04 yeast cake?

So I was washing some S04 yeast today and noticed it was a bit lumpier than most other yeast cakes that I've washed before... Its the first time I've washed S04 and I was wondering if this is a characteristic of this yeast or something else? It was washed from a Milk Stout that had some Lactose in it, so maybe it was that? Did I not stir my lactose enough or maybe that's what lactose does on it's own?

Any help is appreciated. Thanks!

It's characteristic. Some of my SA04 cakes look like cottage cheese.

Ok cool, good to know! Thanks!

That is a benefit of the SO4, highly flocculant!