The first time I took the test was when I started college, right after a rather sheltered up-bringing and then joining the Army and going to both Panama (3 months after our little "excursion") and Saudi/Iraq during the Gulf War. You might say I was rather extreme in my beliefs and ideals at that time.
The next time I took the test was at work, thr third time when I had finally enrolled in college (again) to quit goofing off and get my degree and finally this last time from the test on the Internet.
Much has happened in the intervening years; I matured, the "little things" in life started to matter again (it's very
hard to put much value on a term paper being due when you've had to sit and think of the very real possibility of dying or having to shoot someone in a war situation), I grew older, my views mellowed a little, I met and married a wonderful woman who puts up with me.
It's not hard to understand how some things would change in the tests as I changed, but the situation still amuses me when I recall the person who gave me the second version of the test when she claimed "people never score differently on this test, ever" when I asked her about the first result compared to the second.
I am not sure if there is a "mask" people wear as much as slighlty modulating behaviors that are known to be slightly abrasive unless we, as individuals, are better known. Interesting idea however.