I've encountered a problem and I don't know if it's me, the Columns component, or something else:
Since I replaced the Playlist view's Globals Style default code from an older CUI version with that from the current one, my similar issues which I reported below your post seem no longer to occur.
Menu Preferences, Display, Columns UI, Playlist view > tab "Globals" > tab "Style": the default code for CUI v0.3.8.8 is:
$if(%_themed%,,$if($and(%isplaying%,$not(%_is_group%)),
$puts(back,$offset_colour(%_back%,$offset_colour($calculate_blend_target(%_back%),ff0000,20),25))
$puts(back-selected,$offset_colour(%_selected_back%,$offset_colour($calculate_blend_target(%_selected_back%),ff0000,20),25))
$puts(back-selected-no-focus,$offset_colour(%_selected_back_no_focus%,$offset_colour($calculate_blend_target(%_selected_back_no_focus%),ff0000,20),25))
,
$ifequal($mod($if2(%_display_index%,%list_index%),2),0,
$puts(back,$offset_colour(%_back%,$calculate_blend_target(%_back%),12))
$puts(back-selected,%_selected_back%)
$puts(back-selected-no-focus,%_selected_back_no_focus%)
,
$puts(back-selected,$offset_colour(%_selected_back%,$calculate_blend_target(%_selected_back%),7))
$puts(back-selected-no-focus,$offset_colour(%_selected_back_no_focus%,$calculate_blend_target(%_selected_back_no_focus%),7))
$puts(back,%_back%)
)
)
$set_style(back,$get(back),$get(back-selected),$get(back-selected-no-focus)))