I found some strange issue about the help module..

If I set the module's Cache Time (secs) larger than zero, then it's very easy to get a empty content of the help module?

Actually this issue I have seen in other module also. But the help module is the most serious one. (Every time I set the value to zero, then I got it.)

I need to set the module's Cache Time (secs) to zero to ensure the content wouldn't disappear for user.

Is the behavior abnormal?  I suppose  cache some data can improve performance, am I right?

May I have better solution to avoid this happened? (Can improve performance and get correct data!!)