Product Page Size its BIG (Dawn Theme) & Selection product is wrong on Samsung Mobile! Please HELP

Dear,

I am asking for solutions for two problems I facing:

1- From iPhone Mobile, when choosing any product from the collection, and tried inside the product page to find the items from the menu, once select anything the page of the product becomes too much BIG. This happens only with iPhone Mobile, and once the page comes BIG I need to minimize the page by hand on the mobile screen to return back to the original size.

2- Second problem, on the Samsung Mobile. when I select any product from the collections and tried to change the designs/colors from the menu, it gives wrong info, like when select “Black” its give white product, and when I select white its give “black”, and sometimes when I select from Black to White or Red the product page not changed at all! it’s like freezing, this only on the Samsung phone, this through Google Chrome, but when I use FIREFOX browser it’s working fine.
on the iPhone Mobile, it’s working excellent, the product page is changed without any issue.

Anyone can help, please!