[RAW Images too Dark]

I'm sure Affinity is showing the exposure as less than it should be - it is also brighter on the camera display. To be clear, I am shooting RAW only no JPEG.

Apply tone curve is set on in the develop assistance - if that wasn't on the difference is dramatic. 

I know that I need to adjust RAW files to make them look like how I want them, that's why I shoot in RAW. But I'm sure Affinity is not showing the exposure as it was shot - otherwise why did this never used to happen on Affinity but is now?

[RAW Images too Dark]

I have seen a couple of threads on this issue dating back a couple of years, but no conclusive answer as to how to fix it. When I open up a RAW file into Affinity, it is significantly darker than it should be - see attached image showing the same unprocessed RAW straight out of camera being displayed in Windows Explorer and in Affinity. I never used to have this issue, so something in Affinity has changed and caused it. I am using a Canon 7D mkii and 70D and the issue happens with RAW files from both cameras. I am on the latest version of Affinity. 

What is going on here, and is there an answer as to how to stop it happening?