Changes to quick css keep disappearing

Well…. not exactly disappearing as the code remains visible in the quick css box, but I have to click “save all changes” every time I log out and log back in or the quick css is not applied to the theme. In our case, we are using Enfold with Woocommerce and I have added the following code to prevent related products from displaying in the footer:

.related,products {
display:none; }

When I click “save all changes”, the related products disappear – great! But when I log out and log back in, the related products are back until I go to the Styling page and click “save all changes” again. Note that the code is still there, but is being ignored.

Another related issue is that an image I have uploaded for one of the product categories disappears from my media gallery every time I log out and I have to upload it again.

You can see an example of these issues here:
wp.qwpage.com/product/nv2-accounting-software
(note that related products are being shown, as I have not resaved the quick css yet again today (for the 43rd time)
and here:
wp.qwpage.com/ordering
(note the missing product image for the first category, which was there yesterday before I logged out)

Do you have any idea what might be causing these issues and how to fix them? Please help!