Not sure what you mean. Are you meaning when looking at an issue details view, other users can't edit fields? Or are you referring to the Cog Icon -> Issues -> Custom fields view where custom fields are defined for the entire system?
I can't think of a way that Jira would natively show a lock icon for a field. So I am curious to see exactly what this looks like. If you can please grab a screenshot and post it back here that might help to explain this problem. It could be that your instance of Jira is using a 3rd party plugin in order to provide some level of field security that Jira does not provide natively.
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