I don’t know what’s wrong with phone stronge
What’s the thing’s in other
iPhone 7 Plus
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here is a post that explains what 'other' storage is
What is "Other" and What Can I Do… - Apple Community
Given that this has been an ongoing issue and Apple just released iOS 13.6, I would suggest upgrading if you haven't already and seeing if it helps. Hopefully Apple has been working on this.
If that upgrade doesn't help, here is what I've been telling people
If a forced restart doesn't clear up some 'other' data
Force restart iPhone - Apple Support
Unfortunately the only other way I've found that works is to backup your phone, reset to factory settings (erases your device), and restore from that backup
How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod to factory settings - Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support