Software setting changed the extruder direction

[DoNotTouchMyOj 0]

So my printer (reprap prusa i3) worked just fine, until one day, the extruder just started trying to eject the filament rather than push it out the hot end. I use Cura, and I believe that the issue is due to a setting that I may have changed accidentally. I printed a file that used older settings, and it printed just fine. I have seen many posts that mention switching around the wires, however, I do not think that that would fix the problem because it worked fine before. Any suggestions?