Garbled characters when trying to replace files with Wiiscrubber

It seems that there is no problem if the newly replaced file is the same size as the original file, but if it is different, garbled characters will occur.
I want to change and enjoy music with Dolphin, what should I do?

I'm not an English-speaking resident, so I'm sorry if the document is unnatural.

 

If I select "Replace" and replace the originally existing brstm file with one I created, the file names will be incorrect as shown in these pictures.

But on the other hand, some files have the same name (like the third photo).

Is there anything missing in the explanation?