Tannin Bleed advice needed

Kleankings

New member
I just completed a deck restore. Stripped the wood (sodium hydroxide), Brightened, and after 72 hrs of no rain, stained with Armstrong Clark semi. The deck looked great prior to staining and even after. I got a call from the customer stating dark streaks/spots are present again. Any suggestions, I would hate to have to strip/brighten/stain again.
 
What type of wood ?
 
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