New hybrid bag leaking

I just tied in a brand new bag and felt that it wasn't quite airtight so I corked it up and put a small amount of water inside to see if there were any leaks (I couldn't hear any air escaping).

There was moisture escaping all along the main seam and a bit on the seam by the zipper.

This is more a sanity check than anything because I'm pretty sure I know what the answer is, but this is a faulty bag right?

Like it was pretty airtight, after about 20 seconds I could only fit a small puff into the bag, and I'm generally pretty anal about my bags being airtight so not sure if I'm overreacting.

I contacted the retailer that I bought it from and they said they're very surprised as they've not had a single complaint in the last 12 months and asked me how long it stays inflated because no bag is 100% airtight etc. They did say they'd send me a replacement but the fact they asked about how long it stays inflated for etc instead of just seeing the photos and immediately saying "oh it's clearly a defective product" got me second guessing myself.

I'm sure I'd be able to play on it fine in the short term but the fact the seams are already leaking like that makes me think they'll get much worse pretty quickly.

This shouldn't be happening on a brand new bag, right?