Athletics: The javelin men's WR is 10 meters longer than the hammer WR. The hammer women's WR is 10 meters longer than the javelin. Any explanation?

In both cases, the men's throw uses a heavier object than the women's, but the ratio is very different:

Men's hammer is 7.62 kilograms, while the women's is 4 kg, a ratio of 1.9 to 1.
Men's javelin is 800 grams while the women's is 600, a ratio of 1.33 to 1.

(Edit:) Or, if we compare the objects by gender, the men's hammer is 9.5 times the weight of their javelin, while the women's is only 6.67 times as heavy.

Thus, the women's weight lineup favors the hammer while the men's favors the javelin.

https://en.wikipedia.org/wiki/Javelin_throw
https://en.wikipedia.org/wiki/Hammer_throw

Wes, I think your answer is correct, but the ratios of men's to women's in your edited comment are incorrect.
If the men's hammer were in fact 9.5 times the weight of the women's, wouldn't it have to weigh 38 kg? Similarly, the men's javelin javelin would have to weigh just about 4 kg to be 6.6 times as heavy as the women's javelin.