I have a survey with 15 questions

All questions except question Q4 (which is Multiple choice) are Yes/No
After creating questions, we have reordered them.

Order on admin is Correct but when executing survey, order is not respected

we have that :

Q1 - Question 1 (Y/N)
Q2 - Question 2 (Y/N)
Q3 - Question 3 (multiple choice)
1 - Choice1
2 - Choice2
3 - Choice3
Q11 - Question 11 (Y/N)
Q12 - Question 12 (Y/N)
Q13 - Question 13 (Y/N)
Q14 - Question 11 (Y/N)
Q4 - Question 4 (Y/N)
Q5 - Question 5 (Y/N)
Q6 - Question 6 (Y/N)
...
Q10 - Question 10 (Y/N)

Q11 to q14 should be after Q10 and not between Q3 and Q4

After investigation i think have found the reason of the bug

In BDD, table questions :
title - QID - parentqid - type
Q11 - 42 - 0 - Y
Q12 - 43 - 0 - Y
Q3 - 4 - 0 - M
1 - 50 - 4 - M
2 - 50 - 4 - M
3 - 50 - 4 - M

In generated html code

question id,name etc for html attributes use the format <sid>X<gid>X<qid>
answers of question "multiple choice" use the format <sid>X<gid>X<qid><title>

so, with my example (sid = 1234 & gid = 10)
html id for Q3 is 1234X10X4
html id for choice 1 of Q3 is 1234X10X41 (qid = 4 and title = 1)
html id for choice 2 of Q3 is 1234X10X42 (qid = 4 and title = 2)
html id for choice 2 of Q3 is 1234X10X43 (qid = 4 and title = 3)
html id for Q11 is 1234X10X42

So Choice 2 of Q3 and Q11 have the same id : 1234X10X42 (idem with choice 3 and q12).

Maybe there is others impacts...
The bug bug appears only if title/question code of answers in multiple choice are integere
if i edit answers of Q3 to have that (add a 'R' in title):
Q3 - Question 3 (multiple choice)
R1 - Choice1
R2 - Choice2
R3 - Choice3

there is no bug.

Hope my explication is understable, english is not my native language...