Then this is most likely due to how your "money formatting" is setup in your Shopify admin. Here's how to check and how to customize it:

1- Go to this page in your Shopify admin: https://shopify.com/admin/settings/general

2- Scroll down to "Store currency"  and click the blue "Change formatting" link.

3- Check if the "Email with currency" and "Email without currency" fields are setup to not use decimals. They will say {{amount_no_decimals}}  for example. If so, change that to {{amount}}  instead.

4- Click "Save".

1- Go to this page in your Shopify admin: https://shopify.com/admin/settings/general

2- Scroll down to "Store currency" and click the blue "Change formatting" link.

3- Change the bottom 2 fields, where email money formats are set, by changing this part:

to:

4- Click "Save".

Note: Once the currency formatting has been changed on your Shopify admin, the app will pull out that information automatically after a few hours or immediately after refreshing the store details. After that, it will show the prices you need for any order generated, old or new.