Font size problem in only one slide after viewing it on MS Office from mobile!

[Pranav]

My sister made slides using Libre Office 6.4.5.2 in Ubuntu 20.04 and saved it in pptx format.
Transferred that file in mobile > Launched MS Office (in mobile) > Opened the file (in mobile) > It showed like this:

The fonts in the tenth’s slide looked terrible.
But on the computer, it looked perfectly fine as u can see below:

I wonder what is causing this issue! Is it because of font, MS, Libre, etc? Help me.

> Mobile: Samsung Galaxy A70s Playstore
> MS Office version: 16.0.13127.20166
> Android 10

Update:
Problem is much broader than I thought:
This time, I am not even using MS office, I going to Gmail.com from Firefox 80 and opening this document from the sent document, and it looks like this:

Why there are those dots appearing in the documents? Where they came from? There are no such dots in the original document?

I reopened the document in Firefox from my host machine (Ubuntu 20.04), the problem is the same.

[mikekaganski]

What might “viewing it from mobile” possibly mean? Is there something called “viewing from mobile” that has a universally set and standard meaning in this world?

[Pranav]

Viewing or reading from mobile (Samsung Galaxy A70s) using MS Office. Is that clear?

[mikekaganski]

Better, and then the next question is: do you realize that what you talk about is a bug (naturally, you describe that something LibreOffice generates is not working correctly when opened using reference application for that format); and then had you read what is appropriate for the Ask site, and where should bug reports go?

[Pranav]

Mike, can u please look at my second situation where I updated the post?

[mikekaganski]

Has that second situation made it any different? You are describing a bug; a bug needs a proper bug report; bug reports should go to the proper place; have you filed the report yet?

[Pranav]

1 last question and I will fade away from here: Do you think all these issues I am having, is NOT because of LO?

[mikekaganski]

To the contrary: I ask you for the third time to file a BUG report about a problem in LibreOffice.