Why has my Salvia ‘Hot Lips’ flowers come back all red with the white lower petal changing to red this year?

Same happens to mine. Something to do with amount of sun I think. I took cuttings in spring which have already flowered and they are just red as well.

the flower coloration on these is unstable and therefore variable - you may get a mix of red and white, all white and all red flowers, or all white, all red or anything in between. Often they start out early in the year in a single colour, and then start producing bi coloured ones later in the season, but it is very variable. There's a theory that heat or cold makes a difference - fortunately, bees don't care what colour the flowers are, they still love it anyway.

Thanks Bamboo and Barbarak. 👍🏻