How to resolved routing problem after uninstalling page is display.

Hi I am using widget plugin where I am facing a problem - After uninstalling the plugin I am still able to access the pages that are related to the plugin. but table and plugin are uninstall. why are display page when i already uninstall.
Can anyone help me to resolve this issue.

public override void Uninstall()
        {
            _context.Uninstall();
            
            PluginManager.MarkPluginAsUninstalled(this.PluginDescriptor.SystemName);
          
          base.Uninstall();
        
        }