I don’t think there was actually anything particularly gone wrong with mine, just not to my liking/taste. However, I think I may have found something of an answer. I have tried 5 of the series so far and found that quite a few use the same can of extract and the only real difference is the type of hops used (check the 6 digit product code on the cans) and a different enhancer in the case of IPL which, is similar to, but a bit better than the Riwaka (to me). The one that I have liked (Citra) has a different can of malt than the others, the Nectaron was ok, but didn’t really float my boat, not living up to its hype. I didn’t get the product code from that can unfortunately so which malt that one uses, I can’t say.
The ones I am not keen on, all use the same malt extract so seems it’s just not to my taste.