I’m thrown by your photos because it looks like each set of the mains red, black and white pairs originates from a different conduit. You would think that if both sets came from the meter, they would be in the same conduit.
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If you look closely you can see the insulation as well. It’s a SER 4/0 4/0 4/0 ground.
It’s not unusual for parallel feeds to be run in separate conduits to keep the pipe sizes under control. Not a typical thing to find in residential, but very common in commercial/industrial. I imagine this installation has a long distance between the meter and this panel, so the feeders have been sized up for voltage drop.
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Also, assuming the conductors have been upsized for voltage drop and not ampacity, OP can solve two problems at once by having an electrician land the parallel feeds into some Polaris connectors in that panel, then run single conductors out to the bus lugs. That will solve the double-lug issue for those bus terminals and will allow the Sense CTs to go around a single cable and measure the entire panel load properly.
Additional note: even if the ampacity of those aluminum conductors is exceeded according to the breaker out by the meter protecting those feeders, the electrician could likely use copper conductors between the Polaris and the bus lugs to keep things within spec.
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I knew I should’ve tagged you on this sooner 
I doubt you have doubled up feeds going into your panel. It is most likely you have another subpanel in the house. It is common to feed two or more subpanels from one circuit breaker.
My house is configured with a main panel that only has 8 breakers in it; but it feeds a subpanel with something like 30 breakers in it. And that panel feeds two other subpanels.
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