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What pages are you viewing?
Could you be looking at all topics on one and, and new topics on the other? What you see as "active topics" is set by time logged on last and probably cookies as well, so depending on WHEN you last updated the forum page, one computer "sees" different active topics than the other.
Try a two-computer test. On each computer, mark all forum threads as "read" and go back later without closing either browser window to look at "active" messages. If each computer knows all past threads have been read, you should get the same results on both computers.
There appear to be a lot of HTML errors & warnings in this forum's coding (W3C standards stuff, nothing that we can fix), but that should only affect appearance,and not the number of messages being displayed.
I'd bet a paycheck that the most recent log-in times and/or cookies on the two computers are just out of synch, resulting in different messages being displayed.
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