Script Blocking Bug?

/ (slash) is added before ‘ (apostrophe) of the scripts in the box of Script Blocking box if I click the save button.

If I save this script, the script is changed the below.

Each time I save it, the slash will be increased.

Please tell me how can I solve this problem?

<!-- Google Tag Manager -->

<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':

new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],

j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=

'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);

})(window,document,'script','dataLayer','GTM-ID');</script>

<!-- End Google Tag Manager -->

<!-- Google Tag Manager -->

<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({\'gtm.start\':

new Date().getTime(),event:\'gtm.js\'});var f=d.getElementsByTagName(s)[0],

j=d.createElement(s),dl=l!=\'dataLayer\'?\'&l=\'+l:\'\';j.async=true;j.src=

\'https://www.googletagmanager.com/gtm.js?id=\'+i+dl;f.parentNode.insertBefore(j,f);

})(window,document,\'script\',\'dataLayer\',\'GTM-ID\');</script>

<!-- End Google Tag Manager -->

<!-- Google Tag Manager -->

<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({\\\'gtm.start\\\':

new Date().getTime(),event:\\\'gtm.js\\\'});var f=d.getElementsByTagName(s)[0],

j=d.createElement(s),dl=l!=\\\'dataLayer\\\'?\\\'&l=\\\'+l:\\\'\\\';j.async=true;j.src=

\\\'https://www.googletagmanager.com/gtm.js?id=\\\'+i+dl;f.parentNode.insertBefore(j,f);

})(window,document,\\\'script\\\',\\\'dataLayer\\\',\\\'GTM-ID\\\');</script>

<!-- End Google Tag Manager -->