When the Grid is grouped and there is a locked column set, the grouping columns and the locked column have incorrect widths.
The width of the locked column is 103px although the configured width is 50px. The grouping columns have a width of 66px although the width applied from the theme is 32px.
The width of the locked column should be according to the value set in the configuration of the Grid. The grouping column should have a width as applied by the themes.