Board Thread:Game Discussion/@comment-217.123.81.108-20180416204901/@comment-28176349-20180416210433

That sounds like a reward for recompleting a series threshold. IIRC FM added the One:1 to Hypercar Charge already existing series. So I'm guessing you were over 75%, went < 75% it after the update, and you've now crossed that 75% again.

I (and many others) are in that situation with the Hot Hatch Power Match... I have to put 50-some GC into the Megane since they added expanded the series in order to get 2 GC back for recompleting 100%.

So for you, an extra 2 GC is a good thing even if it's not what you expected. For many of the rest of us, it's not woth upgrading to get such a minimal reward.