This is by far the first time I’ve asked for help with an intractable bus route relation, and I suspect it won’t be the last - but as a user of ID editor, this is another one that has defeated me - maybe someone can fix it in JOSM…?
It’s one of 12 exciting new nightbus routes in Belfast Relation: N12 (19969149) | OpenStreetMap
Unfortunately it is a partial round-trip with two additional out-and-back-again spurs, which both the Relatify and Geofrabrik validators seem flummoxed by.
The ways making up the turnaround at Wolfhill are incorrectly sorted. They are almost at the bottom (the last 3 are correct, the 4 before that are not). The ways must be sorted by the order in which they are visited.
There may be other problems, but that’s the one I found and that the Geofabrik validator complains about.
yes, this the thing - the ID editor put those ways in the wrong order. It’s a longstanding bug where ID spontaneously reorders relations. It’s almost impossible for me to fix in ID - you can spend ages trying to manually put them back in the right order, then it just wrecks it again when you save.