Build Pace Tempo run session - wrong HRs?

My “Build Pace Tempo” session today specifies HRs of…
L2 - 119-137
L3b - 145 - 153

My Critical HR is set to 165 - I’m assuming this is the top of zone 3 (seems right to me) ?

If so how is my L3b only going to 153 ?

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The more I look at this the more confused I get. Looking at the “help” I see this…

… unfortunately no mention of “Critical HR” so I’m assuming it is that shown in the red box?

When I look at my settings, I see this…

…which doesn’t look like the HR zones set in my run above.

Also when I manually change the “Critical HR” here to see what effect this has…

… the Critical HR goes up but zone 3b goes down.

I’m at a loss now as to what is happening. I manually changed the HRs in my run last night and the tempo part felt ideal for me (up to 166bpm)