Hello,

1- So, the same SKU products appearing separately concerned is resolved already on your Site we suppose? Because the Show single variation option is currently off on your Site as we have described it in our earlier response.

2- The dropdown style of Variants are appearing on your Site for the Products because the Attributes that you have used under a Product are not the ones defined under the Dashboard > Products > Attributes:
https://snipboard.io/KUQvFd.jpg
https://snipboard.io/5qJTa1.jpg

So, you need to use the Attributes that are defined under the Dashboard > Products > Attributes > and then add them under the Products like selection style not the vertical line style, please refer to the image for reference: https://snipboard.io/j7dy5M.jpg

Because if you use the Attributes for the Products which are defined on your Site under the said location then you just need to select the values for the Attribute values, you don’t need to define them all manually like you have currently right now.

Hope we have cleared the concept here !

Best Regards