I am doing a search for 2 business class seats between ORD and JNB on TK. I am seeing fares in Matrix of approximately $4600 (USD) per person when the actual lowest fate is approximately $3100. I am reporting this here as I cannot seem to be able to do a custom error report (including my own screen images) via the new Matrix feedback dialogues.

The issue is Matrix is not returning booking code J fares for the flights while Google Flights and the TK website return them. I have wrapped the images in Spoiler controls to minimize the real estate taken when browsing the thread.

Here is the image of for my Matrix search. I am doing specific dates search to give you the most granular data. This fare issue occurs for calendar searches as well.

After flight selection, here is the selected itinerary followed by the fare detail.
Here are the same flights as selected on Google Flights. An additional data point, I get the same result by plugging my dates in to the TK flight search.