Girlfriend giggles when we kiss?

Alright so as of recently, like a month ago, my girlfriend has been giggling every time we kiss. I asked her about it today, and her reasoning was cause she likes me... Lol. We have been together about 2 years and we love each other. I find it weird that she is doing this now. Like another time its because she said something about kissing passionately or something. Honestly, I am not sure how to interpret it because she honestly I don't see why she would laugh... Like maybe get all shy but not laugh. So what could it be? Is it me?
Girlfriend giggles when we kiss?
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