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The nested tbody approach caused browsers to collapse all cells into one column. Replaced with a single flat x-for loop over flattenedRows (computed property that interleaves member rows and store sub-rows). Each row is a single <tr> with 4 proper <td> cells, using x-if to conditionally render member-level or store-level content per column. Sub-rows are hidden/shown via expandedMembers array. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>