The horizontal text alignment problem is due to:

    case(Qt::TextAlignmentRole):
        return Qt::AlignLeft;  // Not aligned

if I change Qt::AlignLeft to Qt::AlignCenter or nothing, it's aligned

    case(Qt::TextAlignmentRole):
        return Qt::AlignCenter; // Aligned

It's not aligned with Qt::AlignRight too. Why AlignLeft and AlignRight push the text up?

Still crashing when sorting columns