Hi,
About showing 15 products, right now, in your website, there are 4 products in the slider only., so it is normal if the slider doesn't slide right/left. But if the slider also not sliding even though there were more than 4 products, then it must be related to jQuery conflict. I can't tell anything without seeing the conflict in your website. Most likely the jQuery JS we used for sliding effect conflicts with something else in your website.
The doubled percentage issue; absolutely didn't make any sense. Very interesting situation. The funny part is, the doubled price applies only to 1 product (not all of them).
Can you provide me your joomla (super) administrator account to This email address is being protected from spambots. You need JavaScript enabled to view it. and let me investigate this situation by running some tests?
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Regards.
Support & Development