It is possible that you have uploaded your logo and when you open the App or the proposal you see the size changed. This is because either the logo size is really wide or long. We recommend in this case to include it on a white 300x300 square size to maintain the shape on every page.
Wait, don't panic, you don't have to call the designer. In this video, we explain to you how to do it in a really simple way:
Basically:
Go to canva.com
Create a free account
Go to create design, specifying a custom size of 300x300
Upload your logo and include it in that shape
Download!