Try to add the following code snippet to the Custom CSS area in Theme Settings to fix this issue.

.single-product-page.product-design-sticky .product-image-summary {
	margin-bottom: 0;
}

.single-product-page.product-design-sticky #woosvimain {
	margin-bottom: 0;
}

.single-product.basel-product-design-sticky .related-and-upsells > section {
	position: relative;
	margin-top: 0;
	margin-bottom: 0;
	padding-top: 80px;
	background-color: white;
}

.single-product-page.product-design-sticky .product-image-summary {
	position: relative;
}

.single-product-page.product-design-sticky .product-image-summary:after {
	content: "";
	position: absolute;
	bottom: 0;
	right: 0;
	width: 50%;
	height: 50px;
	background: linear-gradient(to bottom, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%);
}

.single-product.basel-product-design-sticky .footer-container {
	margin-top: 40px;
}

Regards