Why does the equation tag moves when using `\hspace`?

Question

I am using align environment and sometimes can see that there is an unwated space in some parts of the aligned equations. Hence, I use \hspace with negative length to get the desired spacing.

Even though it works well for the equation itself, the tag sometimes moves horizontally with an amount equal to the argument of \hspace.

Here is a sample. Before

After

The tag of some other equations seem to stay where it should be even after using \hspace

This is What is the difference that made one set of equation affect the tags but the other set work well?

Source code

\documentclass{IEEEtran}

\usepackage[T1]{fontenc}
\usepackage[no-math]{fontspec}
\usepackage{amsmath,amsfonts}
\usepackage{mathtools}
\usepackage[symbolmisc]{mathastext}
\usepackage{blindtext}

\begin{document}
\blindtext
    \begin{align}
        && \frac{X_{th, kp} - X_{b}} {\chi} > \frac{X_{th, kp}} {\chi} & \implies & \frac{1}{\Theta} &> \frac{1}{\Xi} &&
        \notag
        \\
        && &
        \implies & \Theta &< \Xi &&
    \end{align}
\blindtext
    \begin{align}
        && \frac{X_{th, kp} - X_{b}} {\chi} > \frac{X_{th, kp}} {\chi} & \implies \hspace{-10mm} & \frac{1}{\Theta} &> \frac{1}{\Xi}
        \notag
        \\
        && &
        \implies \hspace{-10mm} &  \Theta &< \Xi
    \end{align}
\blindtext
    \begin{align}
        I_{sc} & = I_{sc, ref} & \hspace{-11mm} \bigg[  1 + \frac{\alpha}{100} (T_{op}-T_{ref}) \biggl]
        \vspace{2 mm}
        \\
        V_{oc} & = V_{oc,ref} & \hspace{-11mm} \bigg[  1 + \frac{\beta}{100} (T_{op}-T_{ref}) \biggl]
        \vspace{2 mm}
        \\
        P_{mp} & = P_{mp,ref} & \hspace{-11mm} \bigg[  1 + \frac{\gamma}{100} (T_{op}-T_{ref}) \biggl]
    \end{align}
\end{document}

Answer 1

The negative spacing was only being used to correct for space forced by the extra &, if the alignment is marked with a single & as usual then a far more natural spacing is used

I removed fontspec here so the example can be used with pdflatex

\documentclass{IEEEtran}


\usepackage{amsmath,amsfonts}


\usepackage{blindtext}

\begin{document}
\blindtext
    \begin{align}
        \frac{X_{th, kp} - X_{b}} {\chi} > \frac{X_{th, kp}} {\chi} & \implies \frac{1}{\Theta} > \frac{1}{\Xi} 
        \notag
      \\
        &\implies  \Theta < \Xi
    \end{align}

\end{document}