Weird distortion of image at the top of the object

Hello, I am using blender and Adobe Dimension for the first time and I have an issue. I made a house shaped box object in blender and imported it in Dimension (file.obj), now when I try to place an image on the model it creates a weird distorsion at the top. (see image below) I just want the image to be on one face.

Can anyone help me correct that? Thank you for your time.

Rozenn