If you’re having trouble with Kodi addon repositories showing up empty or add-ons within them not updating properly, you can probably fix the issue in a couple seconds by manually updating the Kodi addon repository in question.
Sometimes you’ll also notice that upon Kodi addon repository installation, not all Kodi addons are displayed. This should also fix that problem, which is sometimes caused by limitations imposed by the repository host.
Step 1: Navigate to the Settings tab under the SYSTEM menu.
Step 2: Click on the Add-ons tab from the vertical menu bar.
Step 3: Click on the Install from repository function.
Step 4: Select the Kodi addon repository that you wish to refresh.
Step 5: Open the Context menu and then select the Check for updates function.
Step 6: Open the repository to find its contents.
If you experience the same issue in the future just repeat this process or restart Kodi. It could also be used to manually check for Kodi addon updates more often.