18.44 GB of 32 GB on my phone is "other". How do I fix that

• Other: Non-removable mobile assets, like Siri voices, fonts, dictionaries, non-removable logs and caches, Spotlight index, and system data, such as Keychain and CloudKit Database. Cached files can't be deleted by the system.
• System: Space taken by the operating system. This can vary based on your device and model.

About cached files in "Other"

Finder and iTunes categorize cached music, videos, and photos as Other instead of actual songs, videos, or photos. Cached files are created when you stream or view content like music, videos, and photos. When you stream music or video, that content is stored as cached files on your device so you can quickly access it again.

Your device automatically removes cached files and temporary files when your device needs more space.

If storage on your device differs from what you see in Finder or iTunes

Since Finder and iTunes categorize cached files as Other, reported usage for Music or Videos might differ. To view usage on your device, go to Settings > General > [Device] Storage.

If you want to delete the cached files from your device

Your device automatically deletes cached files and temporary files when it needs more space. You don't need to delete them yourself.

How to check the storage on your iPhone, iPad, and iPod touch

In short --> Restart the device. That's it.

That is abnormal. It should not take up that much space. Aside from restarting your phone, which may in fact reduce that some, you should try erasing the phone and restoring a backup and see if that helps even further.

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support