ありがとうございます。

ログですが、こちらあたりでしょうか？
違っている場合はご指摘下さい。
【siteログ】
[2021-11-03 01:00:03] admin.INFO [N/A] [294f4f6] [N/A] [Eccube\Log\Logger:log:64] - INIT [] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]
[2021-11-03 01:00:03] request.INFO [N/A] [294f4f6] [N/A] [Symfony\Component\HttpKernel\EventListener\RouterListener:onKernelRequest:123] - Matched route "admin_order". {"route":"admin_order","route_parameters":{"_controller":"Eccube\\Controller\\Admin\\Order\\OrderController::index","_route":"admin_order"},"request_uri":"https://hoge.com/＊＊＊＊/order?resume=1","method":"GET"} [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]

【adminログ】
[2021-11-03 01:00:03] admin.INFO [N/A] [294f4f6] [N/A] [Eccube\Log\Logger:log:64] - INIT [] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]
[2021-11-03 01:00:03] admin.INFO [2b54cd1a] [294f4f6] [2] [Eccube\Log\Logger:log:64] - PROCESS START ["admin_order"] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]
[2021-11-03 01:00:03] admin.INFO [2b54cd1a] [294f4f6] [2] [Eccube\Log\Logger:log:64] - LOGIC START ["admin_order"] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]
[2021-11-03 01:00:03] admin.INFO [2b54cd1a] [294f4f6] [2] [Eccube\Log\Logger:log:64] - LOGIC END ["admin_order"] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]
[2021-11-03 01:00:03] app.INFO [N/A] [294f4f6] [2] [Eccube\Log\Logger:log:68] - PROCESS END ["admin_order"] [GET, /＊＊＊＊/order?resume=1, 240d:1a:5f6:aa00:e45e:2dc9:76f3:c3e2, https://hoge.com/＊＊＊＊/order?resume=1, Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36]


2系からのデータ移行の際、2.11か2.4あたりで運営時期のお客様の購入履歴の商品名部分がうまく移行されていませんでした。
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注文履歴
購入価格は移行されているが、購入した商品名が移行されていない
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おそらく、それが原因かと思っています。

現在は販売していない商品ばかりなので、データベースから「該当部分を削除」で対応できれば、と考えています。