It's because your theme has a unique way to handle our currency format.
Revert back, and the app would work as expected.
Follow these steps:
1. Go to your Settings ->
2. General ->
3. Store currency - Change formatting ->
In "HTML with currency" enter:
In "HTML without currency" enter:
4. Click Save.
* This applies for stores with USD default currency, follow the same steps and change the "USD" and "$" for other currencies accordingly.