The problem with the fonts in Adobe Acrobat

[Victor98A6]

Hello, i have a problem with fonts, with Capital letter, and some another fonts in my book. It happen after i scanned some page from another pdf. In first time there no any problem. but after some minutes of editing pdf its crushing all the time, and need refix all font again and again in manual mode.(i fixed like this way: i find strange letter symbol, after that just make it bold, and not bold, and it apears again)  Im tired to do that.Please help me, how to find that fonts, and how to make it works? Thank you

[Abambo]

First: it seams to me that English is not your first language. It may be better to post in your native language.

The replacement character (crossed square) is shown, when the correct character is not present in the font you use. However, that should not happen with standard Ascii characters as they are part of all the fonts I know.

Is it possible to post a file with the error? If there are confidential information, you could create a file with dummy info in and post that.

[Victor98A6]

I dont know how to send file here, here is file: https://www.dropbox.com/s/xcghk91w8iiqh6w/Pages%20from%20Book%203-2.pdf?dl=0

But this file, sometimes has crossed square, but sometimes capitail letter just dissapear

[Abambo]

Why do you scan them and which tool do you use to scan?

[Victor98A6]

I just import them from another PDF file, I using only Adobe Acrobat. I scan them because i need some music sheet and text from that scanned files.