JS code display on checkout page

Hi,

Just to let you know that since the last woocommerce updtate i got areally big load of JS displayed on my checkout page => https://screencast.com/t/juI51o9Mc

Can you tell me how cna i get rid of this ?

Should i downgrade woocommerce ?

Thx a lot for this plugin, worked perfect untill now ??

https://www.ads-software.com/plugins/woocommerce-poor-guys-swiss-knife/