Is LM3914 protected from reverse voltage?
If you really reversed pins 2 and 3 you have burned your IC.

As the datasheet says, just the Input pin (pin 5) is protected against reverse and
overvoltage signals.



  The simplified LM3914 block diagram is to give the general idea of the
  circuit's operation. A high input impedance buffer operates with
  signals from ground to 12V, and is protected against reverse and
  overvoltage signals. The signal is then applied to a series of 10
  comparators; each of which is biased to a different comparison level
  by the resistor string.