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AIRAC's are a database of airports and navaids used by flight sim aircraft and addons. Many sims and addons come with an AIRAC already installed and sadly, most of them are conflicting versions.
This means that your addons don't get the same perspective as your aircraft. In fact, your aircraft often don't get the same view as your other aircraft!
The answer is to synchronize your airac databases. In this video, I show how you can do that for just a few Euros.
If you want to search for installed AIRACs on your PC, search for the file cycle_info.txt. The content of the file will show the version of the AIRAC you have.