Could be that the decoupling capacitor is not enough?
Is there any difference if it is eletrolytic or ceramic?
When I place the capacitor (100 uF) closer to the nRF24L01+ module, I get more missed packages.
If that position for the decoupling / bypass capacitor ok?
That sounds like the capacitor is acting as an antenna. This can happen because a value of 100uF is made by rolling up a foil sandwich which has high inductance.Try reducing the value to 10uF or so and also using a tantalum, as it is physically smaller and made in such a way as to make the inductance smaller.
Can't say because the supplied image has not enough context.