It's a much paler mixture but the heat and pungency is definitely there. I'm leaving it in the fridge overnight to see if that slightly granular texture disappears.
It's much paler, probably because it's not full of yellowing turmeric! It shouldn't really have a granular texture it should be quite smooth. Best to start out with a couple of drops of water, mix, few more drops mix etc until you end up with a nice smooth mixture.
Freshly made mustard also goes off quite quickly and loses its pungency after a couple of days. You can tell when this happens as it starts to darken.
I'm pleased you've seen the light and now know that freshly made mustard packs a much bigger wallop than the icky jar stuff!
As I said previously, in my opinion, jar mustard and freshly made from powder are two altogether quite different things.