There’s not much we can tell from that text as they’re all valid characters. It may not be including all the characters that were entered into the gig description or showing non-printable characters that are causing the issue.
You’ve successfully posted gigs before. Have you done anything differently this time? Have you entered tab characters or other special characters that you didn’t previously? Or pasted stuff from Word or software? If so try cutting everything and pasting it as plain text. If that doesn’t work you could try cutting it and re-typing it from an empty text box.