Tulip Color and Soil Makeup

I know that acid level in the soil can affect the color of hydrangeas but is that true for tulips as well?

These tulips were a bright, "Hello Kitty" pink last year. I naven't planted any new bulbs out back and this is what they look like this year.

That pink tulip also has three buds on one plant. Unheard of in this yard!

I am not a huge fan of red tulips because, well, they are everywhere. So I know I wouldn't have planted this.
I could blame the squirrels for digging it up from somewhere else but they are not helpful little critters that replant. Unless it is the oak growing acorns that they love to bury and forget about.
A Google search is on the list of things to do to find out about this.