So, thought I fixed the issue, then it came back.
Fallback for items being lower than thresholds when items that are posting correctly have same settings.
[ Price Settings ]
[ Chat Log ]
[ Default Global Category Settings ]
If any more screen shots are needed feel free to ask.
Thanks for your time
Edit: In the price settings I have set the fallback to & of auctionDB - market price. This allowed 4 items to be posted but the rest are still experiencing the same issue.