There's separate title and title_sort columns - did you update the latter via bulk metadata editor?
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Control title and series sorting in the library view. If set to 'library_order', the title sort field will be used instead of the title. Unless you have manually edited the title sort field, leading articles such as The and A will be ignored. If set to 'strictly_alphabetic', the titles will be sorted as-is (sort by title instead of title sort). For example, with library_order, The Client will sort under 'C'. With strictly_alphabetic, the book will sort under 'T'. This flag affects calibre's library display. It has no effect on devices. In addition, titles for books added before changing the flag will retain their order until the title is edited. Editing a title and hitting Enter without changing anything is sufficient to change the sort. Or you can use the 'Update title sort' action in the Bulk metadata edit dialog to update it for many books at once.
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