My issue is similar to Displaying X, Y coordinates on ArcGIS not working but the solution there did not work for me.
I am importing Excel data into ArcMap, and have already saved it as a CSV. When I Display X, Y Data... from the dropdown list, it shows the points at "0,0" on the map. When I change the projection from the WGS84 to Africa_Albers_Equal_Area_Conic, it shifts the points to center on the African continent.
When I brought the CSV into ArcMap, it converted my formatting of decimal degrees (correctly, I believe) and then I padded them with zeroes as that seemed to be other peoples problems (pictures).
The points themselves are all clustered within 1.0m of each other. Again incorrect, but there seems to be slight variation in x, y.