Not loading image when replacing page with custom navigation

Hi.

I followed a tutorial on the YouTube about making a custom navigation bar.

(Link: Appgyver Navigation - 2 - Custom navigation - YouTube)

And this works perfectly on Android but not on iOS.

When I tab a navigation bar to go to other page, sometimes images on the navigation bar are loaded but sometimes are not.

The images shows randomly and I don’t know why.

I just wonder if anyone had same experience like me.