not showing form

woo 3.0.4, wp 4.7.4 on ngnix server, with flatsome 3.3.x theme
https://www.santegra-international.com/produkt/ultivit-90/
[display_stock_alert_form] added in the first line of the log description.

please get it fixed.

please add the form by default to the product page, may let choose the place.
after short description, after titel, …

i trust that you can do it best.