It seems that OpenXP inserts CRLF (#13#10) at the end of every line in the body text of packed messages, including kludges.
In FTS-4000 (
http://ftsc.org/docs/fts-4000.001) we can read:
============
  The <LF> and soft <CR> characters (character codes 10 and 141
  respectively) should not be used within a control pragraph.
============
For better compatibility with all FTN software, I suggest that OpenXP is changed so that it strips LF characters (#10) and leaves only CR (#13) when it generates PKTs - if not in all the body text, at least in the kludge lines.
Carlos
--- GoldED+/W32-MSVC 1.1.5-b20180707
 * Origin: Costa Blanca, Spain (2:341/234.1)