React Shopping List App Debugging

Hello,

I made a simple shopping list app in React for me and my family. There is no backend, everything is stored in the browser. It was fine until I added tabs myself (All / To Buy / Bought) following a YouTube video. Since then things are broken. I am not a programmer.

There are 3 problems:
1. After I reload the page, some items are missing. Mostly the one I added last.
2. When I edit an item, sometimes another item gets changed, not the one I clicked on.
3. The "Remove bought" button removes items that are NOT bought when I am on the To Buy tab.
The code is in a private GitHub repo, around 650 lines. I can invite you as a collaborator.
I need it done in 1-2 days.
In your bid, tell me what you think is the reason for problem 1.