Nitrites already?

Neno reefs

Reefing newb
Tested the tank today and here are the results (used API)
Ammonia: 0.50
Nitrites: 0.25
PH: 7.8 - 8.0
Nitrates: 0

One thing that confuses me is that i already have nitrites and i just added the LR yesterday? Don't nitrites come in the middle of the cycle and not at the begining?

I have 10# of LR and around 25# of dryrock
 
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