Please help us help you and fill where relevant:
Your LimeSurvey version: 3.22.28+200728
Own server or LimeSurvey hosting: Own server
Survey theme/template: Plain_redesign2018_1
================='m having trouble with a mandatory question in my LimeSurvey that uses a multiple numerical scale. The question is set to be mandatory, but when testing the survey:

• If a participant clicks "Next" without selecting an answer on the scale, the page reloads.
• However, the scale itself doesn't function properly. Participants are unable to click and select a value on the scale.

I've ensured the question is set as mandatory, but there seems to be a bug preventing participants from selecting an answer. I've tested across browsers/devices. I've attached an example of the scale when it's reloaded. Any suggestions on what might be causing this or potential fixes would be greatly appreciated!

Please answer the questions from the beginning about version, hosting, used theme.

And provide a lss export of only the relevant questions.

Joffm 

Hi Joffm, thanks for the quick response! I've updated the info.

It's not the slider question.
If you display "question by question" you see that the slider is fine.

It is your implementation of the "autocomplete".
jquery is included already. No need to load a second time.

Remove this and it works.

Joffm

Btw:
In the "workarounds" you find the "autocomplete" solutions based on jquery-ui, and in the forum you find some with "easy-autocomplete". 

Thank you so much Joffm, the issue was solved!

3.22.28+200728

And you really should consider an update. This installation is almost 4 years old and hasn't received any updates, bug fixes and security patches in those 4 years. to be honest, this version shouldn't be out there in the "wild".