It seem that when there are images in the top of the post can cause some format style problem in the “topic list excerpt”.
(It happen in both plugin & TC)
Here is a example.
The first two line is correct, but after a image, the third & forth lines style changed. (It happen in all the theme I have tried)
With inspector, it seem the " topic list excerpt" are trying to include link of image within the excerpt, which cause problem in the style.