Hmm, strange. Not sure if this could be some other custom preference somewhere. But your version is also rather old (over a year). Could be that this was a bug and has already been resolved in the newer versions.
Help us to help you!
Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.