Width of first column increases unexpectedly in QColumnview

Hello, I am using QColumnview for displaying all the files and folders of my partitions on MAC system. It works fine but when i try to click on the items of the QColumnview, the width of first column increases which looks weird. so can any one tell how could i solve this problem.I am using this: ui->columnview->setModel(proxymodel); ui->columnview->setRootIndex(proxymodel->mapFromSource(fileSystemModel->setRootPath(path))); where proxymodel is QSortFilterProxyModel and fileSystemModel is QFileSystemModel.