Steps to reproduce

Create a single select question with multiple answer options, e.g. List(dropdown) and add e.g. 5 answer options.
Set answer option codes to:
0 – Test 1
1 – Test 2
2 – Test 3
103 – Test 4
20 – Test 5

Expected result

I would expect to see the answers sorted in the drop down as:

Test 1
Test 2
Test 3
Test 4
Test 5

This works as expected.

I would expect to see the answers sorted in the statistics as:

0 – Test 1
1 – Test 2
2 – Test 3
20 – Test 5
103 – Test 4

sorted by the numeric value (answer option code).

Alternative: I would at least expect them in the original order, because I can sort them in question edit mode:
0 – Test 1
1 – Test 2
2 – Test 3
103 – Test 4
20 – Test 5

sorted by position.

Actual result

0 – Test 1
1 – Test 2
103 – Test 4
2 – Test 3
20 – Test 5

The results are sorted with the default sort php function, which sorts by each digit.

Especially for Likert scales, this is really unexpected and makes the results much harder to read.

Using natsort(); this should result in the correct human readable order. Using natsort(); should work as well for alphanumerical answer codes.