Hi,
can you please post here your option's list? maybe there is a strange char.

I have the same problem, it concerns any multiple select (checkbox and select).
Here is my list in Russian:

Семейная пара
Несемейная пара
Девушки
Парни
Дети

Any multiple choice more than 2, then accept and it removes all the selection and says that not all the required fields are filled.

Hi,
try to use the format like value|Text for options, for example like

1|Семейная пара

2|Несемейная пара

3|Девушки

4|Парни

5|Дети

Hi,
try to use the format like value|Text for options, for example like

1|Семейная пара

2|Несемейная пара

3|Девушки

4|Парни

5|Дети

In this case the error was caused of the wrong notation, in my case the error was caused by prohibited characters. It would be useful, if you can publish in the documentation a list of characters that can cause problems.

Hi,
try to use the format like value|Text for options, for example like

1|Семейная пара

2|Несемейная пара

3|Девушки

4|Парни

5|Дети

In this case the error was caused of the wrong notation, in my case the error was caused by prohibited characters. It would be useful, if you can publish in the documentation a list of characters that can cause problems.

Now it works fine, thanks a lot !!!