From what I can tell in the photo, the stem appears normal. Newer growth is sometimes pale green in color. The protuberance near the top of that stem in your latest photo looks like a new stem but I see another little growth midway on the stem that I
think looks like a possible peduncle ... time will tell! I hope you will keep us updated with additional photos as your plant grows and matures. I see that you are in Canada, so you might not see much growth during the winter months but next summer it should really take off!
Most Hoyas are vines and climbers (Hoya kerrii included) and they will shoot out new stems and eventually adventitious roots in search of a tree or other structure to climb. Many people grow their Hoyas on trellises or moss totems, allowing them to climb, while others grow them in hanging baskets, letting them dangle over the sides of the pot.
Here in hot, humid Florida, my Hoyas have stems shooting out all over and I tend to just wind them around each other, sometimes using small orchid clips to attach them together to keep them from getting in my way.
These are a few of my plants with stems that go wild.
