Is there a reason why 2ml of Restylane Kysse filler hasn't taken that well on my lips?

I had 1ml of restylane kysse initially and that was my first time getting filler, and the results weren't very good. I had alot of lumps. After 2 weeks and viewing pics she said that to get my desired look I would need another 1ml of filler but to leave it 6 weeks. I have now had the 2ml of restylane kysse in total about 2 weeks ago and I've got loads of lumps and they still aren't as big as I had hoped. My natural lips aren't small to begin with so I'm very surprised and upset that I've wasted £260!