Periodic disappearance of fixed components

[raman-davidovich]

Describe the bug
Periodic disappearance of fixed components in a moment entering in viewport other component styled with react-awesome-reveal library. After scrolling, components return to right places.

To Reproduce
Steps to reproduce the behavior:

1. Use browser DevTools and open site on mobile version(iPhone SE for example).
2. Reboot the page.
3. Scroll down to "About me" section.
4. After appearing photo, ProgressBar and Nav component disappears and return after continuing scrolling.
5. See error

CodeSandbox link: https://mysideprojects.tech/

Expected behavior
Fixed components don't lose their places.

Screenshots

Desktop

• OS: [macOS Monterey Version 12.6.5]
• Browser [Chrome]
• Version [112.0.5615.137 (Official Build) (x86_64)]

Additional context
I am using "react-awesome-reveal": "^4.1.0" because of slide flickers problem in the latest version of the library, but I have the same issue with the latest one.
Github https://github.com/raman-davidovich/Pet_projects/tree/React_portfolio_website/react_portfolio_website