Not a Bug Irregularity when parsing the text

I don't know if the problem is within parsing or if this is normal the thing is when you using certain letters you receive strange response.
For example if you use


Note however that we didn't use any tags and even if you use noparse tag the result is the same. I don't know if is possible to actually run some javascript code when using this which could be a problem.

Examples:

Js //Some javascript code?
PR // Google Page Ranking
JS //Some javascript code?
Pr // Google Page Ranking



Anyway if you are concerned about this, I found this by accident in a game and because we didn't progress so far yet there could be other letters which trigger this. The link to the game is in my signature.