Messed up customer names

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I'm not sure what has happened on my store but names of customers has got messed up (on the order page). On some the surname has been repeated (ie John Smith Smith) and with others, the order number has been added into the customer name (ie #1102 Smith). This has happened on more than half of my orders...the other have remained correct.

All these names were previously correct.

Has anyone else had this problem? The only thing I've done was export the customer list....but this should not have caused this.

Also what has happen to Shopify support? Are we on our own now? I have tried to ask customer support this question but it seems no-one is home to answer questions.