GPU jet engine

GPU: Gigabyte 4070 Fans: Noctua A12x25

installed some noctua A12x24s for all my fan locations in my case, though after installing two closely underneath my gpu(2-5mm of space between) and the gpu fans went ape shit. temps were great under load, and after removing them it was near silent. what can cause this issue? i attempted to throttle the fans on the card but no luck

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