I've been having a weird issue going on with a web application over the past couple of weeks. The application is built with the web app builder and takes advantage of the header controller to organize widgets. Lately, the widgets associated with the header controller won't show up in the correct place when viewing the application (see screenshot). They move to the middle of the page instead of the top right corner, and are incredibly difficult to see because they are white on a mostly white background when this happens so people can't find them.
Has anyone else experienced this issue? It seems to be a relatively new thing, possibly corresponding with the latest ArcGIS Online update. If so, what is the fix?