Seeing RANK3 and 4 uses around 1 to 2 % .

Hi Experts,
Seeing RANK3 and 4 uses around 1 to 2 % with BAND3 44 Cobma RRH , brown filed environment.
BAND3 4
4 Cobma RRH and comba 8 port antenna.
What could be the reasons? software, L1 or stack?