Were you going for a "peek" at the website or a full opening of it in Safari?Tried to use 3D Touch on the link and didn't work. Guess some apps will need to be reworked?
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If it fails in Tapatalk, try with Safari… just for now, until the Tapatalk developer updates his/her app. You could also try contacting the developer. From the app's site on iTunes: "We hope you enjoy the update. If you have specific usability issue especially to a specific site, you can now tap the 'Contact Us' from the Profile tab (Me). Just send us an email and we will help you within two business days."