scrolll down not working on iPhone

Hi there
after almost finishing a website using this theme, i have realised that it does not show properly on iPhone, while it works it the rest of devices. It is only on iPhone (and some other minor mobile brands such us Alcatel…) when it doesnt work.
the problem basically is that the scroll does not work, i cant go down into the page nor get to the footer nor use zoom out.
Anyone has any idea about this or how i can solve it?
Thanks!

the website is https://www.usenreuse.com