Possible deficiency or light burn?

Hello

I’m growing 2 blueberries from clone and 2 amnesia also from clone.
They’ve vegged for 2 weeks after rooting and are now at the beginning of week 4 flower.
Soil : biobizz light mix
Ferts : biobizz biogrow, topmax, biobloom
Soft water is supplemented with calmag.
Lights : gavita 1700e at 70% 20in away (5-600ppfd)
1500ppm co2
Temps 27C day and 24 night.
Rh 55-60%.
The mother plant grew with no problems. All other plants are doing great.

Could this be a calmag issue or light burn? I...

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