Hello,
With your first screenshot, I can see that you have some installation/configuration issue since the HikaShop CSS is not fully loaded.
Now regarding your "pre order" issue, I suppose that you're using the "legacy add to cart" or have a view override for the add to cart.
www.hikashop.com/support/documentation/5...html#advanced_legacy
Please note that the legacy modes do not allow plugins such the "pre order" to work correct ; it will be the same for the "cart side notification" and a big part of the plugins which are sold in the marketplace.
The legacy mode provides a retro-compatibility with the old versions of HikaShop but do not provide the necessary features for what plugins needs, that's the reason why we made a new "add to cart" and a new "checkout" system and be able to release a lot of new features and plugins.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.