When previewing a log I notice that the height defined in mm for the table headers and/or title is not being calculated precisely.
First check the current version selected in the table properties, if the log was created in HoleBASE Desktop then it will show as legacy. By switching the drop down to current it should fix this issue.
The version option was added to resolve a bug with the table header height not being calculated correctly. This becomes more noticeable when you have merged cells of the same height and attempt to align with the table. Please see the User Guide Section Designing Tables for more information.