Canister stove issue

[ViewfinderPCT]

I have an Optimus Crux Lite stove, which I have used without any problems primarily on Snowpeak Gigapower canisters (maybe something else too, can't remember for sure). I'm going on a short trip at the end of the month and don't want to bring a big canister, so I bought a small one, made by Optimus. However, I just tried putting my stove on it, and it spewed some liquid gas and vapor at a point just before it was fully tightened. The same thing happened as I unscrewed it. I put the stove on a Snowpeak canister to make sure it wasn't a defect in the stove, and it did not happen. There obviously should not be any compatibility issues. Did I just get a bad canister? Any ideas why this happened?

[NW Yeti]

That's "normal" until the full canister level drops. Mine did the same thing for the first two days of a six day hiking trip. After that none leaked out.