Why do my product variants keep changing order?

My product page has variant colour and size listed in the correct order then randomly they change order for no reason I can see. I have to manually re-order the list of sizes and colours each time and its super frustrating. Any way of fixing this. I use an external app to help fulfil orders.

Were you able to sort this out ?

I am having the same issue now.

Do you use Netsuite as your ERP ?