Multiple incremental backups

There is probably a simple and logical explanation for this… In the Last Activities view, I am seeing (for only one server per site) multiple “Incremental image backup” rows with time stamps separated by a couple hours or so. Why is this? I expected to see one line for every time a server completes a full backup and one line for every time it completes an incremental backup. Figure 3 shows my schedule as well, which is a simple “backup full every 7 days and incremental every 1 days”.

Figure 1: Example at one site

Figure 2: Example at another site

Figure 3: Settings for both sites

Those should be the image backups of the different volumes, as internally it runs separate backups for each volume.