5G SSB vs CSI-RS RSRP gap

Hi family, In dt I see a big gap between Serving cell ss rsrp and csi-rs rsrp in tdd like 15-20 db. (6beams for ssb)
I checked sspbchpower and csirs power configuration, they are same. What could be the reason of this difference in tdd?

5G SSB vs CSI-RS RSRP gap

According to below source:
UE calculates csi-rs after some time calculated and reports in PUSCH.
So if PUSCH power somehow is limited it can impacts the reported value or
if CSI-RS measured signal is interfered… Still not clear to me…
powerControlOffsetSS=db0 so ss-pbch =csi.rs power
https://www.sharetechnote.com/html/5G/5G_CSI_Report.html#RRC_groupBasedBeamReporting

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