Problem with a shopify app causing items to show £0

I have a swimwear company and use shopify. I have an app called 'Shop the look' which I have had for about 5 years plus without any problems. I have lots of 'looks' set up on here and the matching bikin itemi is shown on the product page, i.e. matching bikini bottom for the bikini top. However all of a sudden the prices for the matching items now show £0. If i delete and re-add the items on the app it does show the correct price for a few hours but then it reverts to £0. It seems to only show £0 for some items not all.

This is causing me a lot of stress as it is currently my peak season for swimwear. I really need this urgently fixed so the prices display correctly.