Social Links Formatting: Spacing does not work properly sometimes

[metters]

The spacing between social links sometimes seems broken.
For example, there might be a whitespace between the last fontawesome and the fullstop:

Running example of this one: issue.metters.dev

Sometimes the whitespace is missing, which i found in a blog, not belonging to me:

No source of this one - I still have to ask the owner whether I may post his blog here.
Source: https://blog.jonasgroeger.de/
I tried to recreate the issue with his links though. This did not work, unfortunately.

In my own example,social_links was configured like this:

social_links:
  github: https://github.com/john_doe
  xing: https://www.xing.com/profile/John_Doe
  mail: mailto:john.doe@example.org

If I change the order the issue disappears. I believe it is not the content of the links alone that determines whether the spacing/formatting works properly. Thus, there should be some other aspect responsible for the bug besides the order of the links.

I only configured the three links of my deployed example, the rest was just a newly initiated hexo-blog with the cactus template., which means the steps to recreate this are described in the readme file.