I don't know anything about your trados edit column specifically, but
the reason that sort of partial mojibake happens in general is that the
file contains mixed text encodings, which some but not all applications
may be able to display "correctly" (without mojibake). The reason a file
may contain mixed encodings could be, for example, because text was
copied and pasted or otherwise incorporated from different sources, and
was not converted to a single encoding in the process of copying the
text or saving the file, or because an application incorporated some
special character or code into the file, which is not part of the main
text encoding, and another application treats is as being part of the
main encoding.
Herman Kahn
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