Parallel batteries: one bank keeps charging when all the others are already full. But why???

After a short break over the Christmal Holidays, I'm finally back in the Off-Grid Garage!
Today, we are having a closer look at a strange phenomenon that has haunted my battery shelf for a long time. When fully charged, the middle battery keeps charging far longer than the other two batteries even they are all in parallel!
I made you an awesome white board drawing where we discuss both speculative causes: is the internal resistance in this battery higher or lower?

After measuring the internal resistance, the answer is clear. Clear as mud!

Battery resistance tester:
https://off-grid-garage.com/measureme...

Upgrading to Aluminium Busbars. Will this solve the issues?
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