Instability of the Product tags in the Product Filter page after installed WP Smush Pro

Hi,
After I had installed the WP Smush Pro plug in and spent 3 days to compressed the uploaded images for http://www.expandore.sg, the first 3 product tags on the left in the Product Filter will move to the lower row whenever the cursor has moved to the rightmost product tag. It happens to every single row. Do I have to deactivate the Plug in? Please advise.
https://www.expandore.sg/shop/?swoof=1&product_brand=anton-bauer
Danny