Hi, as in the new versions of Blender we are experiencing important changes in Cycles engine, we have received reports about strange issues while rendering lens flares with Cycles. So, here I show the correct method to adopt, for now, waiting for the new versions of Cycles and for new solutions that we are going to add to the add-on.
Flared is an add-on developed for Blender for generating complex lens flares effects.

Buy it on Blender Market:
https://blendermarket.com/products/fl...

Buy it on Gumroad:
https://flared.gumroad.com/l/flared

Official Website:
https://www.blenderlensflare.com