A Validation Rule containing the field RecordType.Id is applied online, but not offline. The rule may fire when the offline device attempts to sync.
The RecordType.Id field is a Salesforce metadata-only field and is not supported offline.
The RecordType.Id field in the Validation Rule should be replaced with the RecordTypeId field on the object for which the Validation Rule is active.
CRM Help Documentation: Offline Validation Rules
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