Good to hear that is not only a pilot error. 
As anytime in Aircraft related incidents and accidents, there is a chain of failures coming together.
In your case, first failure was a sim bug which occured at your destination.
Second one, as @trex5365 already mentioned, was a pilots error, because you’re not checked the approach related facts. 
Anyhow, you learned something and in opposite to real life, nothing happend and no one hurts, so you still can have fun with the sim.