[2.6 Update] Product column display is wrong/wrong number of products shown

If you see product on your archives shown in an incorrect number of columns, e.g. 2 instead of 3, or randomly, your theme is not 2.6 compatible.

Example threads:
https://wordpress.org/support/topic/product-archive-showing-only-2-columns-after-woocommerce-260-update?replies=8
https://wordpress.org/support/topic/product-per-row-function-broken-after-update?replies=32

Your system status report (WC > System Status) may indicate that your content-product.php and content-product_cat.php templates are outdated.

Ultimately, this needs resolving by the theme author so please notify them if no updates exist. To work around the issue there are 3 things you can do:

1. Edit these files e.g. yourtheme/woocommerce/content-product.php and remove these lines:

https://github.com/woothemes/woocommerce/blob/2.5.5/templates/content-product.php#L24-L27

https://github.com/woothemes/woocommerce/blob/2.5.5/templates/content-product.php#L39-L49

2. Or, remove these 2 files from your theme.

3. Or, replace them with the updated versions https://docs.woothemes.com/document/fix-outdated-templates-woocommerce/

This will prevent the display issue until a theme update is issued.

https://wordpress.org/plugins/woocommerce/