Hello to all the Amazing ppl

my ECAS got updated yesterday. So the last line was 4th line which says Your medical has been recieved.
The 5th line which got added says : We sent you correspondence on December 12, 2017. If you have not yet provided the information or the requested documents, please do so as soon as possible. Please wait until you receive the correspondence before sending us additional information, as the correspondence will outline all information that is required. We already submitted everything they asked us for.
Anyone has any idea what does it means,is it normal or usual?
Thnx