Cannot edit file name

This is a weird problem with file explorer. (My system: WIndows 8, 64 bit, Inspiron 17R Special Edition Laptop of 2012)

I downloaded some PNG and JPG files, and saved some images as TIF files also. 29 total. I moved them into a new folder. I click on a file name and the name is highlighted, and I click again to put the cursor inside the name so that I can add some text to it, but then the name of the file is once again highlighted - automatically. (I did a McAffee Full Scan and there does not seem to be a problem with the computer.)

I created yet another new folder and moved each of the image files to the new folder one at a time. I was able to move 27 of the 29 files while still maintaining the ability, in the newest folder, to edit the file names. With the 28th file, a TIF file, I lost the ability to edit the file name. So, I undid (Ctrl-z) the move, and then I was able to edit a file name again.

So, I copied in a different TIF image file from a different folder, and once again I lost the ability, in the new folder, to edit the file name.

Older folders have more than 27 files and I can go into and edit those file names. However, even if I copy one of those older TIF image files into the new folder so that the new folder has 28 files, I then cannot edit any file name in the new folder. If I undo the copy, I can then edit a file name again.

I tried copying in a DOC file. That did not cause a problem. I could still edit the file names.

The length of the file name does not matter, however, a short file name is re-highlighted automatically faster than a long file name. By "re-highlighted" I mean that I click on the file name once and the name is highlighted, and then I click again to have just the cursor so that I can edit the name, and yet the computer then automatically highlights the file name again. Short names are re-highlighted in about a tenth of a second. Long names take a half a second or more.

If I keep the number of image files at 27 in the new folder and do not add to it, I can edit the file names. I click and the name is highlighted, and then I click again and the cursor is in the name and I can edit it. If I add one more TIF image file from anywhere, I can no longer edit a file name because the whole name keeps getting re-highlighted.

Very strange. Maybe someone else has noticed this problem.