That's strange, i hope its not a fake! It's an Ergo Sport purchased in-store from My Baby Warehouse.
I struggle to get her to do the "froggy legs" when I'm putting her in it, I can bend her legs when I'm putting her in the infant insert, then they come un-bent when I put her in the carrier. I guess I'm still a bit nervous about using it and getting her in it in case I drop her. I've only used it 4-5 times and I think as she's gotten bigger (now 7 weeks) I feel less confident as she's more awake and more squirmy.
I guess I need to loosen the shoulder straps to make that strap across her back looser, as well as trying to bend her legs so she snuggles in lower. Hopefully it improves with practice!