В файле oi-ya-maps.php в строке
return '<script type="text/javascript" src="https://api-maps.yandex.ru/2.0/?load=package.full&lang=ru-RU"></script>'.
'<style>.YMaps {position: relative;} .YMaps .author_link {position: absolute;bottom: 9px; right:330px; z-index: 999;padding:0;display: table!important;line-height:12px;text-decoration:underline!important;white-space: nowrap!important;font-family: Verdana,serif!important;font-size: 10px!important;padding-left: 2px!important;color: #000!important;background-color: rgba(255, 255, 255, 0.7)!important;border:none;}</style>'.
"\n".$output; // ...and show the map
исправил на
return '<script type="text/javascript" src="' . ( is_ssl() ? 'https://' : 'https://' ) . 'api-maps.yandex.ru/2.0/?load=package.full&lang=ru-RU"></script>'.
'<style>.YMaps {position: relative;} .YMaps .author_link {position: absolute;bottom: 9px; right:330px; z-index: 999;padding:0;display: table!important;line-height:12px;text-decoration:underline!important;white-space: nowrap!important;font-family: Verdana,serif!important;font-size: 10px!important;padding-left: 2px!important;color: #000!important;background-color: rgba(255, 255, 255, 0.7)!important;border:none;}</style>'.
"\n".$output; // ...and show the map
