Currency not converting correctly

I have several currencies activated on my plugin including ZAR (South Africa) which is not converting correctly for a specific product. I can comfortably switch between other currencies on the product e.g. CAD, USD, EUR etc. but ZAR is completely incorrect. The product in question is https://theoutdoorphotographer.co.za/shop/framed-canvas/velvet-rain-diptych/

I have disabled the currency, removed it, readded and reset but no change. PLEASE NOTE: the issue is only specific to the product in question and teh curreency in question and not other currencies or products are affected. Please advise.