If you say you did not enter these strange codes initially, so you will have copied something or clicked twice when entering the subquestions (maybe in quick-add)
Something like that.
Now there are double codes and LimeSurvey renames to these 89012 codes or whatever.
The best to get rid of it. Remove the question and create it again .
Joffm
Volunteers are not paid.
Not because they are worthless, but because they are priceless
I don't know if it is related to the version you are using, but it could be. We would need to look at the release notes for all versions after your version to see if a bug that fits the description has been fixed. But your version is now over 12 months old, there could be a potentially lot of versions in between and a lot of bugs being fixed. This is not a bug I had ever heard of, but that doesn't mean anything, it could be introduced in one version and immediately being fixed in the next one.
Sometimes, the survey is corrupted (for whatever reason), did you do an integrity check? (Configuration --> Check data integrity - You might not have the rights to do so, if you are on a university installation, for example).
You can have a look at the survey logic file to see if you can see something strange and if the item is shown there.
And sometimes, if a survey is corrupted, it helps to export and import it again. Give it a try.
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.