Depending on the physical size of your computer's display and your system settings, OneLaunch will only be able to fit a certain number of app shortcuts within the dock. When apps shortcuts are added to the dock that do not fit, OneLaunch reorganizes the app shortcuts to ensure they're still easy to access.
To access app shortcuts that are not immediately visible within the dock, simply click the button located next to the visible app shortcuts. A small window will pop down within which you'll find the hidden apps.
To make more app shortcuts immediately visible within the dock, please read Fitting more app shortcuts in the OneLaunch dock.