I see a few reasons holding back your production value. Some of these could be new and some could have been hurting this value all along.
1. Your welfare index is 102.25. Check the docs on this the calculation of this value and increase it to 120 or higher.
2. Your supply quality for corps is too low. Try purchasing 200 quality supplies.
3. Your corporate wages are a bit low. Try increasing to 300.
4. Decreasing market prices affects the value of what you produce. Check home equipment right now.