I'd say you just used way too much water. Normally henna drips a little, but not much (I go for more of a loose paste than batter consistency, but I use loose henna powder now, which is a bit different)...Lush henna has cocoa butter (or is it shea--can't remember--one of the solid oils) in it, which complicated things because you have to get that to melt as well as get the henna all wet. I'll add that Lush henna is probably my least favorite henna experience because it was such a pain to prep (as you saw) and a pain to get rinsed out--used up lots and lots of conditioner...(though if yours is really runny it may not be so bad). You will probably get decent stain even if it's really runny as long as you leave it on a couple hours and you got your hair well coated to start. When I used lush henna, I would grate the bar on a box grater instead of trying to chop it up, and that helped with melting/dissolving it faster (but dulled the heck out of my grater).
Anyhow, welcome to henna! Hopefully you love the color, and next time (if there is), it'll go a little smoother for you!
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