This issue is caused when activating the currency converter.
The only thing you need to do is to change your currency format.
1. Go to Shopify Settings - General - Standards and formats - Currency and click on Change Formatting
2. If your currency have period (.) in it, remove the period and then click Save.
3. Make sure to follow the link below to make it work with the currency converter:
For example, you are using Indian Rupees as your currency. You can see it has a period in its currency
This is how it should look like when you apply the fix.