React Studio best practices using AlternativeTo clone

Hi, I started an open-source clone of https://alternativeto.net/feature/ux-design/ to demonstrate best practices for using React Studio.
https://github.com/dryprogrammer/alternative-to

Please let me know if you want to pitch in!

Here is a preview:

I am having trouble keeping items straight in a row. In React Studio, it shows the top offset is too big (red line), while the actual product shows the offset is too small (green line).

Also, with multiple elements, the React Studio visual editor is showing the wrong positions. Notice in the blue boxes, React Studio visual editor looks completely different from the actual result in chrome.

Is this a limitation of React Studio, or am I doing something wrong?