addpath and genpath duplicating the first part of chosen path

I'm trying to set up my file access for a script, but MATLAB's addpath and genpath functions keep duplicating the first part of the file path. This, obviously, throws an error, but I can't for the life of me understand why it does this. Has anyone else experienced a similar problem?

fullfile(pth{2}, fpth{1})

ans = 

    "Users/David/Library/CloudStorage/[e-mail]/My Drive/Calhoun/Functions"

addpath(fullfile(pth{2}, fpth{1}))
Warning: Name is nonexistent or not a directory: /Users/David/Library/CloudStorage/[e-mail]/My Drive/Calhoun/Users/David/Library/CloudStorage/[e-mail]/My Drive/Calhoun/Functions 
> In path (line 109)
In addpath (line 96) 

[Steven Lord]

Can you show us the contents of these two parts of the two cell arrays?

pth{2}
fpth{1}

[Image Analyst]

Yes, how did you get those? Did you do something like this:

p = genpath(pwd)
folders = strsplit(p, ';')

Answer 1

[Stephen23]

You are attempting to add absolute paths but are actually adding relative paths.

[Walter Roberson]

This is the correct answer. fullfile() does not prefix the input with leading '/'

Answer 2

[Fangjun Jiang]

try this example to understand the warning message in related to your input.

addpath("xyz")

Warning: Name is nonexistent or not a directory: /users/mss.system.4nfgz/xyz