hi!
i’m on phone now, so didn’t examined your code carefully, but chances are high that d8 is not a good solution for dht sensor. if i translated correctly, d8 == gpio15, which should be low during boot, so it probably has a built in pulldown resistor. this counter acts against the dht, which should have a pullup to work properly.
please, study this:
also, please make a habbit to use and refer to gpio pin numbering (that is universal among all esp boards), not the d8 and alike namings. those are dumb and meaningless naming convention.
other suggesrions:
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you should put the Blynk.virtualWrites into the if statement, to send value only if sensor was readed succesfully
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do not use dht11 sensors, as they are very bad quality. use dht22 instead.