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I've had the same, on tyres I have fitted there is usually a moulding line close to the rim that I use to check the tyre is on equally all the way around. You'll also need to let the tyres down to put in some sealant (unless you did that before the first inflation). If they are not seated properly I think they will pop off then anyway.
You may know this already but when deflating for the first time I tend to do it slowly to try and reduce the risk of the tyre un-seating. Not sure this really makes a difference but it makes me feel better.
Put a set of 30mm G-One Speed TLEs on Kinlin XR-22t rims. Tyres went up with a track pump and have held air overnight, but didn't get the usual "pop" when the bead seats(?) in the rim. Should the tyres always "pop" on, or does that just depend on the tyre/rim?
Edit: read the links in the first post "Not all tyre Tim combination pop and ping when this is achieved". Seems like it's fine :)