Class D amplifier 1KHz, 5.5KHz IMD measurements

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Hi,
I performed some IMD measurements of my class D amps.
All T-amps are DIY amps from 41Hz.com. I use recommended op-amp buffer (LME 47920 OP) for UCD180LP-OEM.
UcD180HG (without HxR) and TA3020 seem very good and rest of the amps including the very low-cost TPA3116 are also OK.
Any idea why UCD180LP-OEM with a recommended buffer performs quite differently from UcD180HG?
An externally hosted image should be here but it was not working when we last tested it.
 
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