Recent updates to Shopify breaking API

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Has there been an update in the past week which might be breaking integration with my suppliers API?

For about half my orders, when I try and submit the product details to the Print company (Streetshirts) it tells me there is "Product Data Missing" e.g. SKU / Barcode.

However if I create another order with the exact same product and customer it works just fine.  

What this means is that for about 50% of my orders I have to contact the customer and explain why they're about to receive another order confirmation email for the second order, create and submit that order, then modify the original order to remove the dodgy product and add a dummy product so I can mark it as fulfilled and close it off.

It's causing chaos with my figures, telling me I need to refund people etc.

Is there anyone that can help me out with this please?