The ability to convert a text glossary containing semicolon-separated synonyms into a TM without breaking the original structure, and saving it back as a glossary, is a great invention.
But, when I open a glossary as a TM (from Memory menu), make an addition or modification to it, save it, and reopen it in a text editor, the first entry is joined with the header information.
Actually, there is a newline character between the header and the first entry. However, your text editor may have the settings for Windows newline line character. The next update should insert the default OS newline character after the header instead of Java and Unix-based systems newline on Windows.
Thanks for reporting it,