Data lost after going to look for other map

Tetsuya S
Tetsuya S EN Basic Posts: 1 Beginner

I am fairly new to Mindmeister. But yesterday I worked for almost 6 hours on 1 map, inputing lots of data.

Then I went to check other map to come back to the map I was working on and found out that the data were last saved 5 hours ago, meaning all the data that I inserted for 5 hours were gone and could not be found anywhere.

I felt very sad. Can anyone help me here?