On https://www.edx.org/course. The filters on the left sidebar. The "Subject" category has filters that aren't 'real' subjects. e.g. "food". The dropdown filter for "Schools & Partners" also has incorrect filters. e.g. "seakademie" is not a real partner.
The filters should be populated by Org and Subject data from the discovery service. Elasticsearch is doing something weird to it. 's leading hypothesis is that the filter is using a field that is 'analyzed' (tokenized for full text search) as opposed to one that we leave alone to be used in facets.
This is a CAT-2, the discovery team will take this on.