Old and deleted Style still active?

PowerShell Universal
1 
Product: PowerShell Universal
Version: 4.3.3

Hello everyone,

I hope someone knows whats happening under the hood.
I have a simple Page with some UDCards and tried out my first Styles on the mui-Elements. I copied a template from the Documentation which I later deleted and wrote my own style.

What I copied:

New-UDStyle -Style '
    padding: 32px;
    background-color: hotpink;
    font-size: 24px;
    border-radius: 4px;
    &:hover {
      color: white;
    }
    .MuiCardHeader-root {
        background-color: green !important;   
    }
    .MuiCardContent-root {
        background-color: green !important;   
    }' -Content {
        New-UDCard -Title 'Test' -Content {
            "Hello"
        }
    }

New Style:

    $Style_CardAD = '
        .MuiCardHeader-root {
            background: #40A9FF;
        }
        .MuiCardContent-root {          
            color: black;
            width: 100%;
            height: 170px;
            overflow: auto;
        }
    '

Now the thing is, the &:hover part ist still active on the Cards allthough I deleted this part out of my script. Anyone has an idea why this is happening? I also restarted the Service with no result.