Can henna cause hair loss?

Hi Everyone,I am a follower of the CG method on my 3a thick curly hair. I have also been using henna for a little less than a year and been noticing a considerable amount of hair loss between my henna treatments, clumps of hair in the shower and constant shedding during the day.  ( I do a henna treatment every other month ). Is this normal, or is my hair and scalp allergic to henna? 

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