One of the reasons I like the Midnite Solar controllers is that you can set how the controller does the sweeps. You can set it to do periodic full sweeps or a less aggressive P&O (perturb and observe) which sounds like what you are seeing above.
Not surprising. Voltage changes with temperature; current changes with sun intensity (over most of the panel's operating range.)
I've also noticed that the voltage often (usually?) stays constant through short-term changes in sun intensity from clouds passing overhead.
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