Interesting.
I am not suggesting that you actually withdraw the coins, simply enter the number. The idea was to look to see if the USD amount is printed below.
However it seems that the RPD coin is not available in the frontend at all. Check the JSON API with: https://example.com/?__wallets_apiversion=3&__wallets_action=get_coins_info, replacing example.com with your domain. Is RPD in the response? If not:
1. Go to “Wallets” -> “Frontend settings” -> “Disable transients (debug)” and check the option. Does it make a difference? Afterwards, uncheck the option again.
2. Clear your server’s cache. Does the JSON API report your coin now?
Hope this helps. Let me know please if you find something.