Shop Category Page Layouts Broken

Hi, I updated to Woocommerce 3.0.0 earlier today and since then have had a number of issues. I have sorted most of them out but one is getting the better of me.

On all my shop category pages the products are no longer on the same row. Before the update I had 5 products per row but now there are 4 products on 1 row and the 5th & 6th product is on the next row on their own.

Also, the white space between the product thumbnails has increased (is this why there are only 4 products per row?)

I would be very grateful if anyone can help.

With regards
Geraldine
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My website is https://www.faydesigns.ie