I've had the same problem since updating to a Z5 from a Z3. It was originally just affecting sms messages from my boss, but since last week has also affected messages from my wife. The contacts look fine, no spurious characters etc, and nothing noticably different between these and other contacts who work fine. I've installed the Google Messages app and disabled the Sony Messaging app. The conversation histories have all migrated over and, most importantly, I can reply in line.
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