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Spawners have a maximum activation range of 16 blocks (32 meters) but can sometimes be delayed especially if playing on a server.
Were they spawned from visible spawn pads? If so destroy the pads.
You're not going crazy. Turrets do sometimes take time to target so it's not just you.
Make a bug report in the bug section of the forums so it can get fixed.
There is no mechanism in the configs of RE1 where this would happen. My only theory was you are playing on a server that was affected by the...