H1批准后收到邮件说under review是怎么回事？

ε=(′ο｀*)))唉

简直是狗血的各种
6月21号收到H1 approve邮件 （pp）
今早突然又收到下面的邮件。 各位大神了解是什么情况么？ 难道我已经批准的H1又可能有变数？？？

[align="left"] We are still reviewing your case and there are no updates at this time [align="left"] [/align]

[align="left"] [align="left"]We will notify you when your case status changes. We last took action on your case on June 21, 2018.[/align] [/align]