Post formatting

I have tried researching this topic and even though it seems that it is a common issue and probably an easy fix I still have not found a solution.

My Blog
https://grayfishtagresearch.org/fish-tagging-blog suddenly started showing the post preview without any formatting. However once the post is clicked the formatting appears correctly

Example: https://grayfishtagresearch.org/rojo-fuerte

Any advice is appreciated,
Thank You
Jonas