Loud breathing???

Hiya there once again!! Since I have had Flower, I have noticed that when she sits down and has cuddles, her breathing is rather loud and moany, she only sounds like this when she is sat having strokes, when she is running around playing or simply chewing this doesnt occur? Could it be a problem with her breatrhing? or is it normal?

Thank you xxxx

Fudge does this as well, I think its because they like iy so much, like a cat purring!! If you are worried though maybe you should ask your vet.