Hello, OutdoorOutfitter,
Thank you for your response.
We have checked and the issue was with the incorrect location of the translation file. We have moved the file from languages/loco/plugins/royal-core-nl_NL.po to languages/plugins/royal-core-nl_NL.po as shown in the screenshot https://prnt.sc/gtopCs6ag-aA.
Please clear cache and check single product page now.
Kind Regards,
8theme team