Hi MikeC,
Because you have global css rules for all grids in page.
If you want apply to only one grid, you need define the unique css class for that grid, and use in css.
E.g:
delphi code
Grid.Css:= 'my-grid-css';
Then, in css limit the rule like:
css code
.my-grid-css .another{}
Best Regards.