i.e.

  Reward: You earned &b%AMOUNT% &ffor completing &b%COURSE%&f!

The actual in-game output has two spaces after the amount displayed. So instead of just replacing %amount% with a number, it is adding an extra space after the number in addition to it - resulting in two spaces in that language example.

I'm assuming this is in regards to the Economy Reward, this is because the currency name is blank or null then. I will fix this in next update.