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This is likely due to variables within modules being set to Global rather than Local.
See here for more detail: Email Template Syntax - Marketo Docs - Product Documentation
Easy fix, just requires mktomodulescope="true" to be added to the variable settings, e.g.:
<meta class="mktoString" id="btn-copy" mktomodulescope="true" mktoname="Button Text" default="Click Me →" />
That was it! Thank you so much.