What is going on here? Did my Hoya morph? (See below for info)

I’ve had this Hiya for 16 years and it hasn’t bloomed never bloomed. I noticed a bloom yesterday and nearly lost my mind. Upon closer inspection I realized the leaves are different on the part of the plant where the bloom is forming. I pulled the plant away from my others to make sure it wasn’t a rogue stem. It’s definitely connected to the mother and on a very old/hardened/formed part of the plant so it’s not like a random seed fell in and sprouted. Can anyone explain this? I’m so confused.