The front shifter not catching is a common issue with Shmano front derailleurs because the grease gets thick and hard and prevents the full throw of the lever. I try to take the cover off so the mechanism is exposed, and then flood it with a lubricant or degreaser. Keep working it unti the old hard grease loosens up and the shifter should work again.

TBH I detest those shifters. There is just no need for indexing in the front. Friction shifters are all one needs. (And there you have my anti-Shimano, C&V rant for the day.)