This may be a Rust issue but thought you might have some insight and/or a fix.  I ahve a three (3) story/level building but the elevator only traverses between the Top and bottom floors, it does NOT stop at the second/middle floor.  Any ideas?

This is how Rust has behaved for at least a few months. The default action is to go to top or bottom. If you want to move only one floor, hold the use button and select the option to move just one floor. Originally it was inverted, meaning the default behavior was to go one floot at a time.