Why do non-Afrikaans speakers in South Africa have an Afrikaans accent when speaking English?

I see coloured, black, or English South Africans who never learnt or spoke Afrikaans but yet have an Afrikaans accent. What is the reason for this? To me it seems like if I, a native English speaker, for some reason spoke English with a French accent even though I've never learnt or spoken French.
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