Ok let's see, can you do this, in the grid, click the little button on the header of the grid to the left of the Title column, which will bring up a list of columns; enable the "Excerpt" column, and see what it shows for those favorites.
I'm thinking maybe the excerpt column is blank somehow.
If so, then at least we know what's happening, and I can add code to fall back to automatic excerpt when explicit excerpt is blank -- and we can also try to think why the excerpt is blank.
If the excerpt field is not blank for those favorites, then we have to figure out what else is going on. CHS does have some options about how to display excerpts which could conceivably be causing this, but first things first.