Card IDs are not unique #1

Hello,

Cards ID fields are not unique in "cards.json" file. This created a problem when trying to use those as keys for React components. This warning is displayed in the console:

"Warning: Encountered two children with the same key, c3d444c3d2774263ab93598fb0705374. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version."

Thanks!

Marianna