Well there is no map attached ,but the MRAFRICA problem is known in Global Mapper.
You might need to correct the ECW header manually using ECW header editor from - you need to register to download the program but it is free.
Open the the ECW file with the editor and change MRAFRICA to the right projection that you used - I assume MRWORLD or MRWORLD2 should work.
To give a final work wor I would need the Projection and Datum details of the original map and a sample of the converted ECW file.
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