Page title changes on every pages

Hi
I just created my website using Brite. I work with pets and I created a page for each kind of pet. When I change the main title on one page – under the menu bar (like when I write a title for my cat page), the titles changes on all the other pages, so all the pages have the “cat” title. How can I do to have a different title on each page ?
Thanks for your help

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