That is an effect of the dynamic sizing (adjusting the style for different screen dimensions) + it may be because the items are in a flatlist. I will add a dynamic image size setting option tonight to allow users to show the full image ratio rather than a standardized image size.
Edit: dynamic image size setting is now live
I pushed an update to Quiblr. I added the instance detail to the Communities page. Additionally, the vertical 3 dot ellipses on each post has an option called Post Detail >> I added the original post url here
Let me know if you have any additional feedback!