Minecraft Version: 1.7.10
Inventory Tweaks Version: 1.59-dev-152

Doesn't matter how i change setting always same slots are locked (red marks)
eaven when setting were clear:
http://screenshooter.net/100299497/coygolf

That looks like TerraFirmaCraft, and the offset is just enough for the extra slots from a larger crafting space, so that's probably because they don't have a custom handler to tell invtweaks what's actuallly the inventory.