Question Question re appearance of subscribe button

I am using Kunena for the first time on a member's only forum and am currently working through some style issues.
One of these is the 'check box' that appears beside 'Check this box to be notified of replies to this topic.' 
On my site, the check box appears as three dots in an oval, and my client has commented that it's not clear to discern whether you've subscribed or not.
I notice on this kunena forum, that there is just one dot in the oval. Even that would be better I think.

On other Kunena forums, it appears as an actual checkbox which would be ideal.

Could either of these changes be easily achieved?
 

It can be a conflict with your Joomla template. But as your forum is members only I can't give a hint/solution.
You can use webdeveloper tools to check.

Thank you, your reply prompted me to try assigning the forum menu to the Cassiopia template and sure enough the check box appeared correctly. I then reassigned those menu items back to the site template, but set the 'load bootstrap css' setting to No in the Aurelia template. With that set to 'no' the checkbox appeared correctly if you replied to a post, but if you created a new topic the subscribe button was still 3 dots. It also caused a small issue with the display of the Kunena menu that appears at the top of the forum. 

If you're willing to take a look and suggest a solution I'd be grateful, I've given you a direct link to a backup of the site where I initially installed Kunena to review it's features. (see private message for details).