Oh awkward. well atleast now I know the plant's ID :bounce:The plant in the first photo is Ammannia crassicaulis which is a notoriously difficult plant to grow. It also grows quite slowly and seems to take a very long time to recover from nutrient deficiency problems. Here is a PlantFinder entry for a related (and similarly picky) species: http://www.aquaticplantcentral.com/forumapc/plantfinder/details.php?id=118 you can read up on its finicky behavior there.
This particular species often stunts in the way yours does and can do so for many reasons. It is sensitive to GH, and doesn't do very well at GH over about 6-8. If you recently added calcium to the tank then that is likely why the leaves are twisted up like that.
It can also develop twisted leaves when nitrogen deficient, though you should see some of the older leaves deteriorate as well if it is nitrogen deficiency. How do your old leaves look?
What ferts are you adding, what is the GH, and any other test kit values you have available (not pH).
Can you take a few more photos of new and old growth?
When you have corrected the problem the plant will take at least 2-4 weeks to start recovering.