Please excuse what is probably a very simple question. I don't know the correct terminology to describe this better than "added here" as these don't appear to be "in parallel" or "in series" since they're floating off to the side.
Here I am measuring a 100K resistor and it shows as ~100K on the multimeter.
But when I connect the resistors up like this then the resistance changes. I haven't moved my multimeter test points.
I've drawn these out and simulated them using Circuit Wizard.