This trouble is on Winows Opera, but on Linux it works well.
47.0.2631.55 Stable System: Ubuntu 16.04.2 LTS (x86_64; XFCE)
For example, this file in Opera on WIndows machine shows the garbage:
https://app.bigbird.ru/member/printPdf/ea95b28f-4941-4edb-8b88-8634f763ae24/Заказ покупателя (Счет на оплату) №9 от 26-08-2017.pdf