Not as far as I know.
STAKO were accepting returns for bottles that were faulty...but...to check...fill yours up, then dump it in the bath or bucket of water and look for bubbles.
You are looking for a constant stream of bubbles...it may come from the gap between the tank and the reg, this is fine and just means you need a new o-ring on the reg thread (back end).
If you get lots of bubbles from anywhere else On the actual tank, not the reg nipples etc)...leave the tank in the garden and email stako...video or photographic evidence would be useful in your email.