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initial version
tcp-segmentation-offload: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]

Offload processing in the NIC might be affecting the window size.
GRO (Generic Receive Offload) is set to ON in the ethtool output.
As a test you might disable GRO and do the capture again.