When using scrolling with static headers, there is some empty space above the vertical scrollbar. By default it is filled with a background image, which is aligned if the header row is single-lined. Unfortunately, the background image cannot expand automatically to match any header row height.
In your case you can do one of the following:
Replace the background image with the one intended for double-lined header rows by setting
This will work if the header font size and vertical paddings have not been changed.
Remove the background image by setting
Create and apply a custom background image, adjusted to match the header row height in your specific scenario. The custom image should be set like this:
background:0 0 repeat-x url("...............
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