求助！Case was approved, 结果前两天退回成case was received

我h1b十一月底approve了，网站上显示approve，I797也收到了，没问题。准备后天就要去大使馆面签了。结果突然发现case状态退回成Case Was Received and A Receipt Notice Was Emailed。
有人遇到过这种情况吗？
律师说是网站的错误，但会不会是别的什么原因？会不会影响我去面签呢？求助各位大神！