Thank you for mapping these sidewalks and crossings. A couple of things to fix: 
1. the crossing=* nodes should go at the intersection of the road and the crossing. 
2. the curb node should be placed at the edge of the sidewalk where you had placed the crossing nodes in a few cases.

Let me know if you have any questions, I am happy to help out!
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            Published using OSMCha: https://osmcha.org/changesets/133192959
            