I see that egg, thanks
the export is taking something else into accouint re the page background - for example in my case [print document] - the export comes in correct if the page has no shadow, but wrong if it does:
so I can only surmise that something else in your [web] document settings is affecting the output...?
[I tried changing my document type but it made no difference, but it's probably more subtle than just that]
might even be affected by the version of inkscape - mine is 0.92.4 64bit
but FTR I get same in illustrator CS2
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