As you’ve not included how you are adding Tealium to the page, I am going to guess it’s in an HTMLSnippet?
What could be happening is if you are using an HTMLSnippet, each time the page loads you try to include Tealium, but it would have already been loaded from a previous page, hence the multipleDefine errors.
If this sounds right, then you need to load the main Tealium JavaScript once, and the best place to do that is to add it to your index.html. You can then call the view method from the HTMLSnippet to register the page view.
It’s just a guess, but I hope it helps.