Hello,
Theme Options > Styling > Inputs Border Radius > set 100, clear cache of browser on your device, and check.
Try to add the next code in Theme Options > Theme custom CSS > Mobile:
.cart-order-details .shop_table .speedy_row > td {
padding: 0 !important;
}
.cart-order-details #speedy_client_table input {
width: 100% !important;
}
.cart-order-details .shop_table #speedy_client_table td {
vertical-align: top;
}
.cart-order-details .order-review {
padding: 1em;
}
Regards