Co-op career bug

Hey guys,

I just started a new co-op career with a friend of mine and seem to be getting an old bug I used to get in prior games.

Between us we are around 1-2 tenths apart so we started with alpine and VCARB just to equal it out slightly.

The VCARB is faster overall but my friends car just seems like its permanently stuck without ERS even though it is slightly draining.

For example in quali he left it on overtake the whole lap and still had 30% remaining.

Has anyone seen this bug before?

Cheers