Reassessed. I see the error on return, I do NOT see where I entered it in Tutx. Lines 23200 and 23210 - each show $2000 deduction but I only entered 1x in TT. Help!

Where did I make this mistake? It's going to cost me $930 and I don't think I did anything wrong. I know I 'll have to pay but how do I avoid mistake in future. Annoying!!