[Theme: Customizr] Slider problems

One problem & unrelated one question

I’m having problems with my slider, only the first image in the slider order is showing.
The rest of the images added to the slider are not showing.

I deleted the slider I used and all the images to re add them in a new created slider hoping this would fix the problem.
It did not.

I have not changed any CSS (don’t know if that would effect it) except added a code under website/wp-admin/customize.php to disable the pen icon and the navigation bar size.

Is there a possibility to add the slider to all pages and post?