Escape codes popping up when they should not

Sorry if a duplicate/similar issue exists, or this is not even a issue, but i am just an end user who recently shifted to xfce terminal from xterm

I use nnn as my file manager, and had no problems with it in xterm, but i am having 2 issues (i guess they have same/similar reason). when in a directory, we can bulk rename stuff by pressing lowercase 'r', and text file in selected text editor opens up with names of files/dirs of current directory, expected behavior is the names simply coming up, but what i get is that there is an extra '[I' appearing in front of 1st entry like

[I(dir 1)

(dir 2)

(file)

and when i undo in the text editor, this is removed. i also installed screenkeys and used xev to check for keyboard activity but could not find any I am not even sure if it is an escape code or not ( i just know of there existence by using arrow keys in dash, or keypad with number lock off) and this looks similar

another thing is that we can press lowercase 'o' or control and o '^O' on some file, then we can write the command with which we can open, then nnn asks a question if this command will execute in gui or cli "(g)ui / (c)li", i used to get this in xterm but no longer her, and hence open with fails, and i suspect it is because the same or some other escape code is again entered somehow and when we dont press either c or g, then open with operation is cancelled

suspecting i had some shell issue, i made the command to execute while opening the terminal to bash, i suspected it could be some locale or encoding thing, set that to unicode, but to no avail

my config file is here https://0x0.st/HVta.xml