Hi there,
It’s pretty difficult to debug something like this without digging deep into the code of the shortcodes, which isn’t really something we can do.
We can help debug though. For example, is it any two shortcodes, or only a specific pair of shortcodes?
You could try doing something like this:
<?php
if ( is_single( 'post-id' ) ) {
echo do_shortcode( '[Custom shortcode 1]' );
echo do_shortcode( '[Custom shortcode 2]' );
}
?>
Then un-check the “Execute Shortcodes” option.