Low Search - Some collections show the wrong excerpt

Hi Low,

We're starting to implement Low Search on a client site. We've set up all collections and carefully chosen each excerpt field. On the results page some channels show the proper content for {low_search_excerpt}, but others grab the beginning of the first available searchable field instead. 

I don't know if it has anything to do but if I try to paste the index rebuild action url on the browser I get a "Error: Invalid action". Perhaps it's not rebuilding correctly? Any suggestions?

We're using EE 3.5.15 and Low Search 5.2.
Thanks in advance!

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