I didn’t copy it over correctly - it did have three dashes.
I tried your formatting, but it doesn’t help - in my various attempts I often had slightly different formattings (2 instead of 4 spaces, with or without quotation marks around title, …) and none of those seemed to matter, and if they mattered I received an error.
I forgot to mention that it works when I use the frontmatter chunk in the _config.yml defaults, but I don’t want to do it this way because I need to turn the sidebar off for specific pages, which I don’t think is supported by that approach.
Also, when I download the repo and add a custom sidebar like this it works, so somewhere along my customization something must have gone wrong, but I there are no leads to where…I was hoping that someone could point me to possible error sources.
In the last 3 .md files you have permalink: /research/… remove that or make each of those something unique (e.g. permalink: /research/isopods/) so they don’t overwrite Research.md which has the same permalink, automatically assigned by Jekyll.
I totally forgot to modify the permalinks. not doing this late after work would have saved me some headache…I tried a lot to debug this, but didn´t have a clue where to look. can´t something like this generate a warning msg? although I guess it’s not technically an error…