Pachli 2.7.1 is now available.
A change in Pachli 2.7.0 could mis-format the preview cards in posts with links, if the image in the preview was in portrait orientation (taller than it is wide).
This is fixed in Pachli 2.7.1.
Thank you to Kalle Kniivilä for reporting this.
Download Pachli 2.7.1 from Google Play, F-Droid, or the GitHub release page.