PDF editing resulted mirrored or inverted

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Hello,
I’ll be glad if you can help me. I’m using this office suite for the first time.
I was editing a PDF. I clicked on Save as and closed it. When I opened it, the first page I had edited was inverted in a mirror style. I have no idea how to fix this problem. I couldn’t find any solution on the internet.
I’m looking forward to your answer.
OS version: Ubuntu 22.04.5 LTS
App version: version 8.1.1.27 (snap)
Downloaded from: Other (Ubuntu Software). I didn’t use any installation guide

Hello @MaryV,
Please provide the original file as well as the file containing inverted text for analysis


2024_Clase_alusiva_DIA_RESPETO_DIVERSIDAD_CULTRAL.pdf (165.4 KB)
Thanks, DmitriiV