A 2015 Leaf will follow the CHAdeMO spec pretty much to a T. Compatibility between a given station and vehicle is not usually an issue these days, and CHAdeMO itself is pretty simple compared to the monstrosity that is CCS.
I suspect the issue is either with your vehicle itself (not leafs in general), a particular troubled charging station, or the connector on said charging station. Can you say where you've had trouble? Brand, location, and charger manufacturer would be helpful.
Former 2012 SL leasee (6/23/12 - 9/23/15)
Former Honda Fit EV leasee
Former Chevy Spark EV owner
Now driving Tesla Model 3