Hi Enum, Thanks for working on the map! 
I was looking at the marshy area in Uganda at https://www.openstreetmap.org/#map=15/2.3258/32.7738
You classified it as a string_bog, which is more of a far northern, glacial feature associated with peaty land. We don't see those in Africa. https://en.wikipedia.org/wiki/String_bog   The area is muddy, poorly drained land which floods in the rainy season and then stays marshy most of the year. No peat. No parallel ridges, no glaciers.  
Would it be OK to revert the tag to marsh?
- Craig Allan