+1 for PE's answer. I had this happen one time before, some years ago. Same reason, same results.
Yours, I think, are interesting, even artistic. Overall a nice effect. Worth printing or playing with in PP. You may even get one of those (very) rare landscapes worthy of being framed and put on your wall.
FWTAW My comments are that E6 processing at home often produce "variable" (= all over the place) results even with fresh chemistry the greatest of care. In the days when I routinely processed 200+ rolls of 120 every year (which I no longer do thanks to the great technological advances in Nikon digital equipment), Even with using one liter kits and mixing my chems in 250 ml batches, my results were usually inconsistent even from fresh films in the same batch. Nothing disastrous, but requiring quite a lot of extra time at my desktop, correcting this and that in Lightroom. Ugh!
The "it depends" factor came into play too often for my liking. Eventually when other brand kits came into the market, and the price of the Tetenal one liter kits went up to astronomical levels before their supply was discontinued in Australia (oddly the five liter kits continued to be available, but at a price I didn't care to pay and also introducing new QC factors due to unmixed chemicals in big opened bottles), I changed over. As I've already said, I (and everyone else I know who did in 2012) now no longer process E6 at home and in fact almost never shoot slide films at all, and when I do I get it processed by a reliable small pro lab. My life is now that much simpler and, may I say, happier.
With E6 done at home, unless you have a fairly advanced set up with (at the very least) a reliable Jobo system, you will most likely get variations from roll to roll processed. Especially so if you use expired date slide film, in which case the circus doors open and anything and everything becomes possible. I have about 50 rolls of mostly 120 slide films in my freezer, but these days I wouldn't use it for anything valuable. My Nikon D700 gives me the color results I want.
Yet another hard nail in the coffin of color film in today's digieverything world...one of those less than pleasant realities we have to put up with and get used to.
Re mshchem's post, Fuji kits are not available in Australia. As I use a lot of Fuji film, I would happily try one of their kits if a small (one liter) is available. But at US$225, oi...!