text: At first sight, the image from the iD editor looks peculiar, with a river segment drawn diagonally from one bank to the other. But on recreating this, I can see that it is caused by only some of the multipolygon elements being downloaded. If all of the multipolygon elements are downloaded then the river is rendered correctly in the iD editor. So, editing the multipolygon to sort the outers into a logically ordered sequence *might* improve its handling by iD but generally it looks like a limitation of the editor that is responsible for this effect. The think that the other image is the Standard map at level 19. I can see the same effect but it only seems to apply to the Standard map at level 19. The other map styles and the other levels (18 downwards) seem fine. So that makes me think it is problem with the serving of the Standard map tiles for level 19 only. I take your point about clearing the local cache but it hasn’t resolved the issue in my case either. However, as it only seems to apply to level 19, I still think it is a ‘serving map tiles issue’ rather than an issue that requires an editor correction to the multipolygon. I suggest that we wait to see if it is an issue of outdated map tiles being served and check whether it resolves itself in a few days time.