I have been running into this issue a lot on a "library" run. Not sure if it is directly tied to this vessel or just my luck.



1) Those keepers will spawn multiple times in the same room and overlap. What I have seen is the keeper + its special elite version, both in the same room on top of each other.

2) When overlapping, sometimes, not always, their indicator (the flashing monster icon at the side of the screen) would disappear and you would not know where they are. The only reason you'd know there are some left is because your health won't regenerate after presumably killing everything.



Screenshots :



http://cloud-4.steampowered.com/ugc/532875698556919731/D9E7717F8238ADF18B8C47DCFC86DC9CF6D17AB3/



http://cloud-4.steampowered.com/ugc/532875698556920943/CC3B9BC61F446C40684018979C95E08D53AEB0A3/