Under certain circumstances it is possible that DBQueue Tasks can "overtake" each other. For example, DBQueue tasks with a lower Sort order are being processed before those with a higher Sort order.
This is a product defect (31296). This bug is a side effect of hotfix #31217 and hotfix #31296 should only be installed if hotfix #31217 has been installed.
This will be fixed in a future release of the product. If you require this immediately corrected, please contact Support for a hotfix referencing the defect ID 31296.