I was expecting the attached documents to have the images inserted so we could understand your issue.

As you are inserting a known image you already know what the height and width are supposed to be. So why are you not setting them explicitly? Always better to do that than relying on setting LockAspectRatio.



However, if the quality of the inserted image is important you should always ensure that the image is the correct size before you insert it, instead of relying on Word's scaling. JPEG is definitely not the format of choice for a logo as it will not scale well. PNG works better for older documents, SVG is perfect for current version of Word (Word automatically creates a PNG of the SVG as a fallback).