Lead is already converted but still editable. Lead OWD-Public/Write/Transfer which i think doesn't have anything to do with converted leads. One solution is to create a validation rule to avoid fields from being edited if status is Converted, but its troublesome to maintain such big validation rule for each field. View and Edit Converted Leads in profile is unchecked. How can I make the Converted Leads read only or make sure that fields are not editable once its been converted?
[SalesForce] Turning Converted Leads to Read-only on Lightning
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I know you said no validation rules in your question, but based on your comments it seems like it's more of the aesthetics that's keeping you away from them. From personal experience, as long as you have a good error explanation that doesn't leave users confused, they have no problem with validation rules. In case you decide to go this route, here's a rule that may work for you.
AND($Profile.Name = 'Read-Only Profile', ISCHANGED(Lead_Status))
Error Message: Lead Status is a read-only field for users with the profile 'Read-Only Profile'
Hope this helps if you decide to use this.
In the Reports tab, create a new report using "Leads / Leads with converted Lead information" if you want to get account, contact, and opportunity information side-by-side with the lead, or you can use a normal "Leads / Leads" report to get any fields from the lead that have been converted. You can add a filter for "Converted equals true" to find just leads that have been converted. Viewing a converted lead directly simply shows the account, contact, and opportunity (if any) it was converted into.
If you don't have access to this information, it's possible that your profile may be missing some permissions; contact your administrator for more details. If you are an administrator, then contact support for additional assistance.
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This will solve your issue. updated the answer after getting confirmation