Manually promoted results (in curations) randomly change after a webcrawl


We have an Angular application using App Search. The web crawler uses 1 domain , and all the webcrawls are always successfull.

After a webcrawl is done, the promoted results (that were added manually) in active curations seem to change: some of them revert to previous results, sometimes they come back or others unrelated ones take their place (despite their content not having been changed).
(The top organic documents list is different as well.)

This makes our suggested results partly unreliable.

Has anyone had a similar issue before?
Is there anything specific we should be looking at?

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