The citrus swirl was changed because Dole changed the recipe/ingredients in the mix. It's made exactly how it used to be but ingredients are slightly different now.
As far as the strawberry swirl goes, that should (should, not 100%) be coming back soon. It was taken off the menu because way more people buy the lemonade and raspberry lemonade slushes. During the hot summer months, one machine can't possibly keep up with the demand, so they brought in two machines. Unfortunately, no room for three machines.