Help identify problem - infection/deficiency?

Hi, I've planted Sensi Seeds' Silver Haze and Jamaican Pearls about 2 months back. Today I noticed some leaf damage/rot and am a bit worried. Please help me identify the problem. Here are details:

Age: ~2 months
Location: Outdoor with 6 hours of direct sunlight.
Weather: Currently monsoon season here so humid and rainfall. (Plants are protected from direct rainfall)
Growing medium: Cocopeat + vermi compost (1:1, no soil)

Thank you!