# Referencing equations not working?

### Things I have tried

In this forum, although automatic numbering and referencing don’t work, there is a manual workaround as what follows:
$$e=mc^2 \tag{abc}\label{name}$$
You can now refer to this formula: $\eqref{name}$

But what I get is this… weird… Does anyone have the same problem?
Sometime the reference will be ???

### What I’m trying to do

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