Could you provide your Confluence version?
And it will be good, if you provide more deatails like, which document gets problem. It is pdf, doc, docx, etc.
Kindly could you use this instruction for troubleshooting.
I have tested on 6.3.4, 6.5.0 - everything is ok.
Could you provide info about fonts and what about text in russian on the page?
Could you check it with this example:
Anyway, have you create a ticket here https://getsupport.atlassian.com ?
I hope it helps you
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