Your Hlog seems to suggest that you have a bridged tap.
See the attached MDWS graphs.
Although the U2 band is not now visible in your own stats, probably due to poorer SNR than samwise78, the visible elements do appear slightly similar (in shape).
Could your own connection possibly have a slight HR/bridged tap somewhere?
It has been mentioned previously that your U2 Hlog graphs didn't look quite right, especially when some of the U2 data was visible.
It may be better to further discuss your own connection in the AlecR's woes thread though, rather than divert attention from samwise's thread.