Webinar Registation form does not work properly in Firefox

[Vlada_Prasolova]

We are currently conducting a webinar and i've just lauch the registration
I've checked the page in all browsers, however, it turns out that some users in Firefox and not able to answer multiple-choice question in the form - it simply shows them 1 first answer and does not allow to choose anything else

in Chrome and EE all works just fine

i've used standart "select" type with "allow multiple selection"

is there a way to fix this while the registration is in progress?

[Anonymous]

Can you share the link to your registration page?

[Anonymous]

The Firefox version used is also a helpful detail.