Default apps keeps switching randomly

## What Happened
In the applications tab, the default applications keeps switching randomly even after i reset them correctly.

## Expected Behavior
Default application set should not change without permission.

## Steps to Reproduce
1. Open settings app and click on Applications tab
2. Select default apps for different categories.
3. Upon closing and reopening the settings app, the default applications change at random to other apps.

## Platform Information
+ **Settings Daemon**
+ Version 1.0.0

+ **Operating System**
+ elementary OS 6 Odin
+ Ubuntu 20.04.3 LTS
+ Linux 5.11.0-34-generic

+ **Hardware**
+ Inspiron-5559
+ Dual-Core Intel® Core™ i7-6500U CPU @ 2.50GHz
+ Intel® HD Graphics 520 (Skylake GT2)