Jonna: Your Hoya plant is beautiful and I agree with everyone else, there's nothing wrong with your plants leaves at all. Many hoya's have the silver like mottling on the leaves; H. pubicalyx 'Pink Silver' I believe is one named because of the pinkish-silver leaf mottling. Some of the Hoya carnosa's have leaves with the mottling/splashes too.
Check out the leaves on these H. pubicalyx photo's:
