How did 4021 get assigned to an arrival. Magic fingers? (ATC-SIM)

submitted by donmclaren48 to /forum/atc-sim

This was not a missed approach. Somehow 4021 got assigned to a flight and of course I got a proximity violation with another aircraft assigned and stable at 5K. I rechecked and discovered that an assigned altitude of 4K on one aircraft actually displays as 4021. I was able to fix by reassigning "C 4". How did 4021 get assigned to begin with? It is a arrival and did not miss an approach.

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