Created by: mznet
I've found that a spacing problem between dropdowns on docs. This problem is caused by left margin even though line breaks. To fix problem, I removed left margin between dropdowns on xs size and applied the margin on over sm size.
You can check the issue on Sizing section of dropdown page. Check it on xs size screen. And this issue is happened to v4 as well as v5.
Preview: https://deploy-preview-31841--twbs-bootstrap.netlify.app/docs/5.0/components/dropdowns/#sizing