Occasionally you can run into some mobs that ignore what light level the block they spawn on is, allowing them to spawn in well-lit areas. I've run into this occurrence 3 times while playing survival in one sitting.
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duplicates
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-49616, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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