Steps to replicate the issue:

• Open an article with sub-references on a mobile device (probably just iOS?)

What happens?:

• Observe that sub-ref footnote numbers are displayed correctly in the article (e.g. [3.1.]), but not in the reference list:

What should have happened instead?:

• Display the sub-ref numbers correctly just like in desktop view

Other information:

• I can reproduce the issue on an iOS device using Chrome / Safari / Firefox and also on a MacOS device using Chrome / Safari / Firefox (choosing mobile instead of desktop view).
• Cannot reproduce it on my Linux laptop using Chrome / Firefox and mobile view

Next steps

• Try to validate and reproduce the issue ( might be caching )
• Look into possible solutions ( might be a CSS issue )