I figured out what was going on after making the first comment. I waited a bit to see if it was true.

I originally posted my article in Discussion. Before getting moved, it acquired 16 points. Now (at the time of this comment) there are 28 points. So it got 12 points after being moved to Main.

I have two comments; the totals are at 19 points. The “regular” points I got are [19 from comments] + [16 from Discussion] = 35. The points from Main are 12 * 10 = 120. Adding these up, the total is [35 regular points] + [120 points from Main] = 155.

The Total Karma is indeed 155, whereas the Karma for the last 30 days is 299. This comes from a simple [19 from comments] + [28 * 10 from the post] = 299.

So it seems that the Total Karma and the Karma for the last 30 days are handling the case of a moved post differently from one another. Is there a moderator or someone with experience who can confirm or disconfirm?