upping bench weird

[24tyrone]

my chest has been weak always tbh and never been my fave muscle to train

im stuck and cant get my lifts up

i can do 1 rep jsut about with 100kg
then after that im so dead i cant lift 70kg

i have done both my rotor cuffs in the past so my shoulder joints click n crack like mad and can start hurtin(im sure this is a big reason)

i need some tips to get my bench up
i can do 85kg for like 2 reps then im all out

and i can do 80kg for 5 reps which is what i usually use for my chest excercise

but then i can close grip 70kg for 7reps and do 10 sets

help me out guys im puzzled that i can close grip that much but can only bench 10kg more

for bench i start sticking just above the chest and also before i lock out my arms

im actually embarrased at how much i can bench
even tho i have long arms and injured

i can upright row with 100kg with ease 10 reps 8 sets i do so i just dont know whats up