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THS4631: THS4631 as DUT to Network analyzer

Part Number: THS4631
Other Parts Discussed in Thread: TINA-TI, , OPA320, LMP7718, OPA838

Hello,

I connected the DUT to the network analyzer (Agilent 4395A). The configuration is shown below.

The bodeplot of the DUT, connected to the VNA, is shown below

The frequency response of this bodeplot is correct (The simulation is shown below), but the main thing is: I have encircled the part in the magnitude plot (shown above) that is unusual behaviour (around 2 MHz to 10 MHz). What is happening there and is it possible to avoid it?