People usually sample the movements of a pig population from a very limited amount of information, such as with the OP. As such, they have a very incomplete sampling of what is going on in the lives of the pigs. This is part of the reason that "patterning" hogs is so problematic.
So maybe you have a cougar. As ST, noted, that isn't going to drive them away. Besides, except for mothers with very young offspring, cougars tend to stay on the move and do not den up in a given area for extended periods of time. It is late in the year and if it was a mother cougar, then her young would be old enough to roam. If a cougar did move through, even a mama, it would not have stayed for long. Two weeks of missing hogs would not be due to a cougar as the cougar would not be around for two weeks.
At my place, I have two feeders within 50 yards of one another, in sight of one another, but one is more in the trees and the other is out in the open. It is the oddest thing. We will get hogs that will go to one feeder, but not both. One feeder can have a sounder hit is repeatedly and no hogs will show up on the other feeder. Then again, we get hogs that hit every feeder on the property as well. You never know.
This is also getting to be the time that acorns are dropping. It is no uncommon to see a falloff of activity at the feeder when the acorns fall. Hogs love corn, but they love acorns even more. Plus during this season, they can eat and eat all the acorns they want and not run out. They have no need to go to the feeder. Numerous times, particularly during the fall, I have watched hogs I thought were going to the feeder that either don't stop at all, or don't stop long enough for a bite or two before moving on.