Please help us help you and fill where relevant:
Your LimeSurvey version: 5.2
Own server or LimeSurvey hosting: own server
Survey theme/template: vanilla
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We use a Net Promoter Score plugin for 10-step Likert scales.
This type of scale requires to add answer options numbered from 0 to 10.

Looking at the results, I notice, that the results are sorted this way:
0, 1, 10, 2, 3, 4, …

It seems that sorting is done using the default PHP sort function, which leads to this somehow correct but not human readable sorting.

Using natsort() would result in the correct numerical sorting, as well as in a proper sorting with alphanumeric answer options.

 
 

This is a general issue, not related to this question theme.
So, file a bug report.

[url] community.limesurvey.org/bug-tracker/ [/url]

Joffm