It is not a mistake, but as you pointed out yourself.
When Taylor finds Hopper, he informs him that time in the cave moves differently and you can also see it in that scene very well. There are still alive Conquistadore fighting with Natives and in the same time frame is Hoppers sister as kid and a man hunting her. Earlier you see Hopper also following the cowboy into the cave, the cowboy walks in ulta slow mo (but visible) for him until he follow him into the time trap. He then exit and it seem like a few years passed.
Same seems to be with the gang, Furby communicate with them, but if they had been already in the same time trap as him, he had been long time dead as in that part years are passing by in a few seconds. They also find Hoppers Mom, just died, if she had been in the same time trap, this had been just seconds - even with the cavemen way too less time to die.
tldr: The walkie talkie was so strange because of the time distortion. Like with the slo mo cowboy to Hopper.
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