Find the "custom field" that doesn't show up in the product page.
Look at the "Layout position" field. It should be blank.
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About your 2nd issue. There must be a "more info" button (in addition to "QuickLook" button) which goes to product details page. But apparently you have disabled that button. Open this plugin: "Flexible VM2 Template", find this parameter Show MORE INFO icon and enable it.
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The administrator has disabled public write access.