This is related to a core issue: #214856: CSS and JS for Cached Blocks (drupal_add_css incompatible with blocks)

A workaround might be to add the css file in hook_init().

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#1 faceted_search_461606.patch664 bytestetramentis

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tetramentis’s picture

Version: 6.x-1.x-dev » 6.x-1.0-beta2
Status: Active » Needs review
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new664 bytes

As suggested, adding hook_init() with faceted_search_ui_add_css() fixed the problem for me.

Patch is for "6.x-1.0-beta2" of the "Faceted Search UI".