Hi, there is an error in how you mapped the streams in this area.
https://waterwaymap.org/loops#map=18.08/-26.773139/152.8872
Waterways need to be mapped in the direction of the water flow. You have part of one waterway flowing into a water body then along the edge and then out of the water body back to where it started from?
https://wiki.openstreetmap.org/wiki/Waterways 