I finally got the hang of breastfeeding and now...

I finally got the hang of breastfeeding and now dd is doing this weird sucking action and I don't know how to correct it. It sounds like her lips are slipping off, so you can hear the suck suck suck noises quite loud. Her mouth isn't closed around the areola. It looks like she might be using her tongue more than she should be. I've tried reattaching her sooo many times. It doesnt seem very efficient as its taking a long time to empty the breast. She is also doing it all the time on the left breast but only sometimes on thr right. Has anybody else had this? Do you know why or how to fix it?