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Haven't seen a 694 but this is a common occurance on Berettas. It typically happens when the top lever is actuated, some people inadvertently brush the selector with enough force to move it, happened to one of the guys on my league squad all the time. My DT10s and some of the 68x guns have a locking screw to prevent this however, it also defeats the ability to choose which barrel fires first which can be a bit of a pain shooting sporting clays or even skeet.
Here's a shot of one of the DT10s with the locking screw removed:
Here's a shot of one of the DT10s with the locking screw removed: