Anyone else's romance decaying like super fast?!

Ever since the new Lovestruck pack, I've noticed that the romance bar between my sims goes down like super fast! My sims are literally on their honeymoon together, and in the day my sim spent skiing (instead of whooho-ing all over the place) it's gone down by like 30 points! They don't have any of the love avoidant traits and have no negative sentiments against each other and have a high level of attraction and satisfaction.

Is it a glitch, or am I doing something wrong!