Code of Single Quote showing in Title Text on Product Image

Hi Guys,

Good Day! I have an issue in the product images set as a variable.
The current display when a user visit a certain variable product and hover on the main image the title attribute is showing properly, but when the user selects already any option in the variation then the text of the title attribute is showing the hex code of the single quote.

Please see attached screenshot for better understanding, along with the link of the site.
https://gyazo.com/61fc3c4663e9ac90abb2bbd1bf4d2e7f
http://naturallytimber.sitebyspin.com/product/mango-creek-extension-tables/

Thank You in advance

Best Regards,
Simon