ESP8266 deepsleep LED still alive

I set my esp8266 Into deep sleep mode. As soon as i do so, a Led connected to GPIO 0 illuminates.
It only happens at GPIO 0. The Led is not completly switched on, it’s a little bit dimmed.
How can I avoid this by using Software programming or a Hardware component?

Need to see the wiring diagram - sounds like a back feed is powering board via done thing you have connected to it

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