That sucks :/ I've not had that happen to me (yet!). I'm not sure how you're doing it but I only ever do it manually, so typing the cut between the angle brackets < > with or without the additional "cut text="thing you want the text to say" option. I know on LJ you can highlight the text and then press a cut button, is that similar here?
If it keeps happening, maybe contact support or check to see if others are having the same problem? The admins on the site are really helpful and friendly from when I have had issues :)
Hope you can sort it out.