Did you try removing your glasses/specs when you are near your twin 1? I have to agree that sometimes things we wear carrying might have some negative effects on our child.
When my girl was around 4-ish months, she was quite fine when my nephew carried her. But as she approached 8-ish month, each time he came to her and stretch out his hand, she will turn her head away and started to wail. She has always welcome my niece to play and carry her. However, one day we found out that she frowned when my niece tried to pick her up and we wonder why. Accidentally, we found out that the 'cap' was the 'culprit'! My niece was wearing a cap/hat when trying to pick her up. So we did an experiment - niece worn the cap and picked my daughter up and then removed it the moment my girl started to turn away. Magically, my girl started to smile'.
My girl dislike certain colour/design of tees that my spouse has put on and he has to change a new one just to get a smile back!