>>For example, the negative TN modifiers on academic tests due to mind imparing circumstances. It is acctually suppose to be a positive modifiyer. That is a mojor rules point that can cause a bit of a problem with game. <<
I can explain how something like this can occur.
Everyone in the office is clear about how modifiers should work. The table is typed up correctly. Then someone says "waitaminit!" and makes an argument for one table to be different from the others. The table is modified. Then, someone else comes a long and says "won't that be confusing?" and the table is changed back. Then, someone else comes along and says "no, won't be confusing at all." Back goes the table. But then someone misses something and adds an error at the last moment.
And by this point, everyone is so confused as to whether or not it should be a + to the TN or a – to the test result, that it slips through.
Two months later, when no one has even thought about the PG and has moved on to something else, and we see the table in question it all becomes clear.
It's really a problem when you're working with 200+ pages of text between five people and you're looking at it every day for a year and you think the text says what you mean because how could it say otherwise? When in reality you're (us) putting in your own spin and seeing things that aren't there. After a while, you don't see that there are minus signs where there should be plus signs, or you think they're right when they're wrong.
It's a wonder there aren't more typos and erratta in all RPGs, actually.