Broken on react 17 and 18

[amandahp]

Describe the bug
Odd numbered cards simply dont appear on react 17 and 18. Rolling back react version to 16.4.0 made it work properly again.

To Reproduce
Steps to reproduce the behavior:
1-Create a new project with react 17 or 18.
2- The data that is presented as example on the readme can be used.
3- Only one card will be shown.
4- If we keep adding cards, only the even numbered cards will appear on a given lane, the odd numbered cards will not be shown.

Expected behavior
Show all cards