|You haven't told us what type of "operating software" you are using.|
In fact I don't know if "operating software" is even the correct term.
Typically a computer will load an OS - Operating System - when it powers on. e.g Windows XP, OS-10, Linux, UNIX, etc. Once the OS is up and running, any number of applications can be loaded and run on the computer.
Since you say that you "open the operating software" after hitting the "syncronize button" (whatever that is) it sounds like you are opening an application sometime after the OS is up and running.
Assuming that's the case, I would suggest that you speak to whoever is responsible for maintaining your software and ask them why the application doesn't recognize the fact that DST is in effect.