When running an unsynchronized query for the first time Deskzilla downloads most of the bug details, however some of them are downloaded later, when you open a bug details. This is reflected in the bug info bar at the bottom of the bug details are.
To download all details for a set of bugs, select these bugs in the bug table, right-click them and select Download All Details or press SHIFT + F5.
If bug details were downloaded before, but you want to make sure the bugs you are viewing have all the latest updates, select and right-click them and select Reload All Details or press SHIFT + F5.