I installed an external antenna to boost the signal and I have a strange result:

if I attach the antenna to the main socket it boosts the DL speed to 100Mbps DL and 15Mbps UP

If I attach the antenna to the ext socket it boosts the DL speed to 60 Mbps DL and 40Mbps UP

I really don't understand this asymmetry. Anyone has an explanation for that?

Do I really have to switch socket based on my necessity? (boost UP or boost DL)