It was the left side. I can’t post a screen shot because I ultimately made it go away. However, before doing that I saved the logs. All the items that were not syncing had the same log message:
2020-12-27 03:23:46 Puller (folder "xyz" (xyz), item "abc"): syncing: chmod /data/sync/abc: operation not permitted
This was due to device A (where the error was shown in the left panel) had “Ignore Permissions” UNCHECKED, which device B had “Ignore Permissions” CHECKED.
I configured them in this way because I wanted device A to determine the permissions. I thought that would work because of:
[v0.8.10] Ignore Permissions - Announce - Syncthing Community Forum
When the checkbox is checked for a given repo files originating from this node will be announced with the “no permission bits” flag. Other nodes will use whatever their default permission setting is when creating the file.
I am still looking for a way to have one device propagate permissions to the other device(s). (And I really with Syncthing could be made to do that for owners, groups and ACL’s, but I guess that isn’t in its roadmap.)