Score on the pet food store. We have a bunch of those types of stores here and I've never heard of some of the brands you mentioned!
I don't know if this is why for Olive, but Asia started having this problem and she never did before. When they have higher numbers and there is all that sugar in their urine, it's actually sticky like sugar! The pee clumps more readily stick to the litter box and more litter sticks to their paws if they step in the pee clump. Will be interesting to see if the problem goes away when she spends a good amount of time below renal threshold like it did for Asia.