I have totally 93 bookmarks in my Chrome. When I got into https://www.google.com/ settings/chrome/sync and clicked the "Stop and Clear" button, all the data on the serve was cleared. Then I signed into my chrome and started to sync. 1. After I signed into chrome at the first time, the data on the server was as follows

2. A few minutes later, I clicked the "Stop and Clear" button again. At the second time I signed into chrome, the data was as follows

3. Then repeat the previous steps. I Just clicked the "Stop and Clear" button and signed into chrome again. This time, the data was as follows

Because the number of bookmarks is unchanged, always 93. However, the number of book marks that the server received every time was not the same. Also, none of them was equal to 93. When I deleted all the bookmarks of my Chrome and then received the bookmarks from the server, only part of these 93 bookmarks were gotten and the rest were all lost. I am just wondering why this would happen? Is there any problem with the server?