I just planted pumpkin in 10 spots with 2 seeds at each spot. Only 2 spots had 2 plants germination. Sometimes it is for germination reasons. I basically had the same result from apple cucumbers.
Or transplant one of the pumpkin to another spot and grow it also. When planting 2-3 seeds close together think about planting them 100-150mm apart so that if you want to move them then you can retain a fair amount of soil around the roots when moving them, helps with transplant shock.
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