Tier pricing not showing on admin

I’m working on a Magento site trying to sort out Tier Pricing.
However it does not show on the admin area, the advanced pricing section exists but not tier prices.
Now there are a lot of extensions installed here, so presumably one of them is removing or breaking it.
How can I search for the culprit?

Everything displays and works normally on the front of the site. I just can’t control it via admin.