Popping/clicking noise from road bike
You have a Shimano 105 5603 series 10 speed shifter paired with a Ultegra 6700 series 10 speed rear derailleur, as those are both 10 speed they will work together.
Those will not work with a R7000 series 11 speed cassette. Even if you thought you could just select 10 sprockets out of the  11 that does not work. Sprocket spacing is different between 10 and 11 speeds.
Also the HG CN-6701 chain is 10 speed specific and would not work properly on an 11 speed cassette.
Get a 10 speed cassette to make this setup work.