pdf's wont open when clicked

For some reason all pdf’s on my site don’t work when clicked normally. The only way to open them is by right-clicking and opening in a new page. When searching I found many similar problems but none quite the same as this. Hope someone knows what is going on and can help.

Here is a link to a page on the website that has a pdf: https://peanutgallery.co.za/products-page/laundry/biowashball-2/

I am new to wordpress and this site so any help will be appreciated.

Thanks,
Justin