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9:51 AM
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A: Using labels with mathJax?

Davide CervoneNote that \tag, \label, and \eqref all play different roles in the process, and you would need to use all three to accomplish your goal. The \tag{x} macro adds an equation number that appears at the right of the equation; it does not create any symbolic name for use with \eqref. That is done th...

Tl;dr: One should not use a label already used in some other post in the same thread because when a thread loads, all MathJax codes are processed at the same time and so MathJax throws an error if there are two equations with the same label (If such an issue has not been discussed on Meta.Math.SE, it may not be a bad idea to start a new thread talking about it because it can be a widespread one among users).
Solution: You can use the "tag" code alone, as explained in the above answer. However, since you are a high rep user and your edit would be implemented without being reviewed, I suggest that you change the label in the OP to another one, for example, "*", and so change them in the "\ref"'s in it.
 
It is worth noting that there are some MathJax-rendering bugs having nothing to do with the codes involved in a post. Some browsers on some devices render them perfectly and some cannot. For example, see the following post:
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Q: Some iPad web browsers do not render some MathJax codes

LaterAs we know, well-known iPad web browsers such as Safari, Chrome, Firefox, ... support JavaScript, which is needed for rendering MathJax codes on many websites like Stack Exchange. However, I have been informed that some parts of MathJax codes on some SE posts, like this answer, cannot be rendered...

 

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