"Find All" is showing wrong count

I have a range of data, this data includes articles with HTML codes. Each cell have one article and a total of 200 articles therefore 200 cells.

To explain in short, each cell have the word "<footer" in it. What I want to do is find the exact text "<footer" and replace it with, lets say any character "a" or "b" or whatever. But when I replace it only replaces 25 out 200, I am not sure what's wrong. Please help, I am badly stuck in this.

Please find the excel attached.