Asking about white space on product page cause mobile view shifting right when moving down

[BaoTran12]

Hi there, this is my online store: ventureshoppers.com . I currently have an issue with my main product which is this link: Mini Printer - Learning, Study Notes, Anatomical Diagram, Photos & Jou – SnapPrint (ventureshoppers..... This is the only page that cause the issue ( The Right Side Of It is white and cause shifting page when moving downward and upward). My home page is fine, there's another product I'm using the same template as the one having an issue now but that product page is totally fine. So I'm very curious how to define and fix this issue. Also, There's also issue with my image when I try to change the variant, the old variant's image is automatically shown underneath. Thank you for helping me!