Row select works on sandbox demo but not locally

[xavortm]

Hey! I have been struggling with getting row selects to work for two days now... And I keep getting issues even by trying to get as close as possible to the row select demo.

SO I tried to copy-paste it to my local setup. And I have the same problem. This is the sandbox I use which seems to work on the app. When I copy-paste it to my create-react-app setup, it doesn't.

What means not to work - When I select one row on first click, it triggers it. When I click on second, it doesn't, but toggles the checkbox. When I pick third checkbox, it removes the previous or adds two of them, but the status doesn't change below. If I toggle all from the header it selects 3 or doesn't depending on on/off. But for individual rows it doesn't work.

And I can't figure it out - it does work on the demo URL above but not locally.

Here is my package.json file. I relaced my App.js file with what is in the demo above 1:1 so that there are no other components in action.

There are no console errors. Any ideas? Thanks!