WOOF Product filtering not working as it should

When filtering in stock items out of stock products still appear. As an example: When i filter Size: M, Color: Lila and select In stock the product “Lila Wildlife T-shirt” appears but is not available in size M.

Is there any why to fix this problem. On our test domain this issue does not exist.

The page I need help with: [log in to see the link]

 

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