Maqetta's widget palette is controlled by a configuration file (releng/davinci.releng/orion/builder/rootfiles/siteConfig/widgetPalette.json), and that file includes widget GridLayout and Carousel only when the user creates a "mobile application" and does not those widgets if the user creates a "desktop application". This is because those two widgets are for mobile UIs, not for desktop UIs. Therefore, I suspect that your local build will show those two widgets if you create a mobile application there.
Note that there is a drop down menu at the top/right of the widget palette which allows a user to tell the widget palette whether to show "Recommended widgets" or "All widgets". If you choose All widgets, then the widget palette will include all possible widgets no matter whether you create a mobile appilcation, a desktop application or a sketch.
Jon Ferraiolo