Suggestion: class .price and .pricing must be font-family: 'PT Sans'
For example, the Russian ruble symbol appears correctly under the following conditions:
1)
<link href='https://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700,700italic&sub set=latin,cyrillic,cyrillic-ext,latin-ext' rel='stylesheet' type='text/css'>
2)
class .price and .pricing must be
font-family: 'PT Sans', sans-serif;
3)
taskerr/includes/payments/utils/currencies.php
'symbol' => 'р,у,б,',
change to
'symbol' => '₽,',