That looks like a password field from an add-on. The one I'm thinking of blocks transitions (and may do work logs too) unless a password is filled correctly in the field on the issue. But I don't think it's available for recent versions of JIRA.
Could you check what type of field customfield_10600 is? Go to https://<yourjira>/secure/admin/ConfigureCustomField!default.jspa?customFieldId=10600 and that will give you the name of the field. Then go to the list of custom fields, find the field and look at the "type" column
Sorry, I missed your first response.
It's not the add-on I was thinking of. It looks like the electronic signature add-on which requires you to enter an extra password when "signing" an issue.
I don't know why it might be used during logging work though, might be worth raising it with support for that add-on.
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