Hard Drive becoming more fragmented

After purchase, when first running Defraggler, my drive was about 4% fragmented. I run Defraggler once or twice each day. Now a little over a month later, I'm can't get less than 15% fragmented. Typically there are 10 to 15 files causing the fragmentation. However, if I defragment them individually, I can still only get to 15%. Why does the fragmented portion keep increasing and what can I do to make it go the other direction? My disc is a Samsung SAMSUNG MZ7PA128HMCD-010H1

Is this drive not an SSD?

Such a small amount of fragmentation should be left alone. There's no such thing as 0% fragmentation, Windows becomes a messy child while you defrag (it refrags). Don't forget that over defragmenting (doing it too often) can/will kill a hard drive.

please don't defrag a SSD.

there is simple no point any more, it's a left over constraint from the HDD days.

the physical differences in the way SSD's store data eliminates any need for defragging.

all you need is an occasional Optimise.

It's an HDD. In running my multiple defrags, I found it was the index files that were causing the biggest issue. The page files are large, but I wouldn't expect them to be defragged. The index file kept getting larger and larger. So I rebuilt the index, it reset at a much smaller size and now I'm running 2-4% fragmentation. Much better!

Are you sure it's a HDD? All googling turns up SSD for the model number you provided