[Elecraft] KAT3 problem?

[Peter Collins]

My K3 is only 4 days old so I am still becoming familiar with it and the
controls and I still have a big smile on my face!
It is 100W unit with KAT3. I occasionally get HI SWR readings and have
noted the following effects.
10W into 50 ohm load display shows 1.6:1 ATU bypassed, with the ATU tuned
it SWR=2.2:1
My TH3jr has a 1:1 SWR at 14.160 with external SWR meter. The K3 shows
1.0:1 with ATU bypassed and 2.4:1 with ATU in circuit and tuned.
Can anybody shine some light on this?

Cheers Peter
VK3BPN