All upload data and annotation disappear!

I had uploaded about 400 jpg image and started lableing last night
However, when I try to log in from the other PC the check, all origin data and labeled data disappear
And there was not any record when I do the health check…
How could this event happend ??!!
And I could I regain my images with annotation ??

Hi, did you select “Save and Continue” to complete the upload before labeling? And were the images assigned to a batch?