Hye,
I have read your message and I looked a little in my documentation about Jess.
In the book Jess in Action the author has written about Matching global variables the followings:
"If you match to a defglobal with a pattern like (score ?*x*), the match only considers the value of the defglobal when the fact is first asserted. Subsequent changes to the defglobals value will not invalidate the matchif the rule was activated based on the value of the defglobal, it stays activated even if the defglobals value changes. The match does not reflect the current value of the defglobal, but only the value at the time the matching fact was asserted."
I hope you will find a solution for your problem.
Ana Tanasescu
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