It should be a taper snug fit.
Mine pops out when wiggling back and forth while lifting.
It may be that there is a burr on one of the tapers. Try feeling (carefully) to determine if something is amiss.
The best way to attain a good fit is using polishing compound while rotating the parts against each other.
Another way is to carefully use emery paper or sand paper on the taper connections, only is a burr is felt, to remove the burr.
