@AsAdmin Thanks for reaching out.
Can you help us with what do you mean by more charges than others ? Do you see the charges being more than other days for a similar number of logic app run ?
The playbook consists of the logic apps which costs when you run them and the kind of triggers you have that in logic app. One important thing to notice is check if someone added some extra step in logic app which can cause it to do something extra and thus charging you more.
Logic apps gets stored in a storage account so you will be paying the storage account as well but that will be minimal. In your subscription if you filter it for per resource within subscription you can actually how much a particular logic app costs. You can even check that for per day.
This is a screenshot from my lab environment : (This is when you have access to subscription cost blade.)
Azure Sentinel also has a dedicated workbook for the cost it incurs including logic apps :
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