Go to "C:\Users\*username*\Documents\Substance Painter\shelf" and remove the "allegorithmic" folder.
If you have modified the default preset you should also remove them from "C:\Users\*username*\Documents\Substance Painter\shelf\export-presets".
Then re-launch Painter, it should fix the presets. Don't forget to reselect the preset in your export window, by default it will keep the outdated one.