We just modified your carousel particle to open the new with new window
You can copy and apply particles/carousel.html.twig file for other site. The issue already fixed and we will update it soon.
Note: By default if you didn’t assign the style for Carousel that means Carousel using default style, the links for carousel items no longer working with Default carousel style, we just fixed by adding new rule for default style.
We are waiting for the stable of Uikit3 https://getuikit.com/ (current beta40) so we can finish our Gantry5 particle version 2 🙂