Issues with Multiple regression: t value keeps changing

i am trying to create a multiple regression with the function:

  1. lm(DV~IV+IV,data) and 2) lm(DV~IV+IV+IV:IV,data)
    There was the only problem, that my t value for the first function was at "20.784" and for the second function, including the interaction term, it is "10.424" . I can't understand why it's changing (and if it's related to the interaction term) or what would be the meaning of this change.
    Thank you for your help!

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