Sound Mix Class Override Problem (UMG Slider) - Where is the Problem?

Hey Guys,

in my actually mobile Game, ive a very strange Problem with my Music Slider.
Whenever the Settings overview Widget with my Slider opened, the Value of my Music are changes a bit. If you look at the blueprints, this is logical in itself, but many tutorials on the internet have described it the same way, so I’m very surprised. I have attached detailed screenshots from the widget to saving.

Detailed Problem:
The standard Values of my Slider are (0=min, 2=max, standart=1, steps=0.5)
When I start the Game without save game, the Slider are on Value 1 (Middle). When I decrease the Sound on 0.5, save the game and restart with a Savegame, open the Settings >> the sound decrease automatically a bit. That means the Slider position are always on its standard Value (1), and then it decreased to maybe 0.5 (Savegame), but then the Sound also decreased. that’s logic when you see the Blueprint, but how can I fix this? As I wrote before, I saw this on many many tuts out there.

After three long days of pain, I need you’re help!!!

Initialize Loading (Game Instance)

Save Game Function (Game Instance)

Save Audio (Game Instance)

Music Volume Slider (UMG - Widget)

Settings Menu with UMG Slider in it (UMG - Widget)

push!

push again!!