Additional surcharge for A Product Not Being Applied At Checkout

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Hi There,


I have an online perfume store and one of the products is a sample pack where the customer can choose the scents they wish to sample.


Six of the scents have a $1.50 surcharge that, when that scent is chosen, it does advise the customer of the extra cost. However, upon checkout, the extra fee is not being applied.


Is this an issue with the app? I think the app is InfiniteOptions. I cannot check at the moment as Shopify is saying my Apps list is not available.


Has anyone else had this problem?


Many thanks