PyQt6 combobox weird black bars on top and bottom sides

Question

I tried almost everything (Adjusting heights, removing paddings) but can't get this black bar get removed from combobox.

Stylesheet I am currently using

QComboBox {
    border: 2px solid #AD86FF;
    border-radius: 5px;
    padding: 10px; 
    min-width: 200px;
    min-height: 30px;
    font-size: 16px;
    color: #333;
    background-color: #fff;
    margin: 0px; 
}

QComboBox::drop-down {
    subcontrol-position: center right;
    border-left-width: 1px;
    border-left-color: #AD86FF;
    border-left-style: solid;
    background-color: #fff; 
    padding: 6px; 
    margin: 0px; 
    border-radius: 0px; 
}

QComboBox::drop-down::indicator {
    image: url(./assets/dropdown.png);
    width: 16px; 
    height: 16px; 
    background: transparent;
}

QComboBox QAbstractItemView {
    border: 2px solid #AD86FF;
    border-radius: 5px;
    selection-background-color: #8F6ED4;
    selection-color: white;
    background-color: #fff; 
    alternate-background-color: #f0f0f0;
    font-size: 16px;
    color: #333;
    padding: 0px; 
    margin: 0px; 
    spacing: 0px;
}

QComboBox::item {
    height: 30px;
    padding-left: 10px; 
    padding-right: 10px; 
}

QComboBox::item:selected {
    background-color: #8F6ED4;
    color: white;
}

QComboBox::item:hover {
    background-color: #e0e0e0;
}

I am thinking this issue is not from qt itself but from my window manager, gnome (wayland). Your thoughts? How I can fix something weird as is.

I tried out different padding, heights, margins (even resetting all custom style). The black bar still appears.