Hello,
1) The problem is caused by your custom CSS code in Appearance > Customize > Additional CSS area – https://prnt.sc/pltgqy http://prntscr.com/plthdl You need to change or delete it.
2) You can use this code to remove categories from the single products page:
.single-product .product_meta .products-page-cats {
display: none;
}
(Theme Options > Theme Custom CSS > Global custom CSS)
Regards