Hi @NadineNezdoba,
I cam across this thread when doing a cleanup of the community. In addition to clearing your browser cache as @KristinL recommended earlier, have you checked to ensure you're using a supported browser and device? Generally Canvas supports the most recent 2 versions of popular browsers, and I know the dashboard is one place that can act very weird with older browser. Even if the browser worked in the past, Canvas is always making updates to keep things up to current web standards, so browser, operating system, or device updates may be needed to get things working again. In the worst case scenario, if the device is too old and no longer receives updates, you may need to look into a replacement.
-Chris