I saw something similar I was trying to debug the other day.
The image is fine (I would use PNG since it has text) but when webflow is creating the responsive images and the size parameters, it is adding some additional sizing code that is creating the issue with a browser.
<img src="https://assets.website-files.com/5c51fd5850968d635f794dd4/5cba2c4666d1ec42dbeaebff_PharmaSense-Mobile.jpg" width="900"
sizes="(max-width: 767px) 100vw, (max-width: 991px) 4vw, 5vw" alt="">
The issue appears to be with
4vw, 5vw, if I delete that in devtools, the image clears right up. Ball needs to go to webflow.