I have seen this before, it usually happens when the configurator has been created in Linnworks before the Attribute Sets in Magento.
At the moment I can't see an update button in the Magento configurator screen on Linnworks.net but if you can go to http://www.linnlive.com/ and choose either the EU or US version (or better yet, click the product listing button on Linnworks desktop) this will take you to the old listing tool.
Go to configurators, and select the Magento configurators and on the top left you will see and update button, click that.
Let me know if that solves your problem :)
All the best,
Fitted Commerce - Ecommerce Agency and Linnworks Specialists
The Linnworks User Hub - Facebook Group
I have a problem regarding in Adding variation product from Linnworks to Magento. Ive already set an Attribute Set in Magento Backend but it didn't reflect to Magento Configurator in Linnworks.net.
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Please help me !