If I search for the java tag I see 344,380 questions tagged, but if I click on a question it says there are 344,401 question with the Java tag. I can understand the information being slightly out of date but it appears it is also inconsistent. If I run the search again, I see the first result still. Over time they both update but appear to be slightly off.
The value for counts is cached for quite a while, the expense of making that 100% accurate all the time is sooooo not worth it.