Adobe Bridge Technical question...[Why are photos removed from main screen when keywords are added?]

I downloaded Adobe Bridge on a Windows laptop and started organizing photos from a folder. While organizing the photos by selecting the groups of photos on the bottom left-hand panel that shows you the "File Type", "Keywords", "Date Created" and so forth, I start by selecting photos under the "Date Time Original" dropdown and I like to select all in a specific year. My troubles begin when I select a specific photo(s) and start adding keywords and the program decides to take those photos away from the main screen and then I find them under "Keywords", but no longer under the date they were under. I NEVER asked the program to move the photos anywhere, I was simply adding keywords. Why would the program remove these photos from the main screen and place them under "Keywords"?