Glass Render issues

hey I just recently creted a topic covering glass rendering tutorial and stuff, I also have seen a forum saying path tracer is coming soon on D5 may that will fix these issues
however this thing is lil different I just rendered Glass in 1K, 2K and 4K

all of them 3 have different outputs and Surprisingly 1920x1080 has best output

this is my glass in scene

and here are render differences

1920x1080 :


2K:

4K: