I have an editable grid with an addRowLink, when I clicked the add row link, the grid somehow changed, like first column became wider and last column was narrowed, anyone knows why
The only think I did in addRowLink is append a new item to current list
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If you don't have column width/weight values established, this would probably be expected behavior as the grid auto adjusts column widths given what's actually being displayed in them.
What Mike said. It looks like your placeholder values in your dropdown fields are longer than the real values that will generally be in these fields. As a test, change the placeholders to --Select-- to see if the behaviour changes.