Strange startup behavior on emacs 26.3 and malfunctioning commands

[Carlo Tambuatco]

I have emacs-28 and emacs-26 installed alongside each other. I use emacs-28 
most of the time, and only 
use emacs-26 occasionally. I download and compile all my emacs packages using 
emacs-28, which starts 
and initializes flawlessly and works exactly as I expect it to work. But, 
emacs-26, which reads the same 
init files and uses the same packages as emacs-28 encounters errors like:

Transient error: (wrong-number-of-arguments (1 . 1) 2)
Error during file deserialization: (wrong-number-of-arguments (1 . 1) 2) [2 
times]
File mode specification error: (wrong-number-of-arguments (1 . 1) 2) [26 times]
etc…

during startup. 

Whenever I run a basic command like ‘find-files’, which is maped to 
‘helm-find-files’ because I use 
helm, I keep getting the error:

transient--pp-to-file: Wrong number of arguments: (1 . 1), 2

Even when I try closing emacs using C-x C-c, I get the error:

Wrong number of arguments: (1 . 1), 2

I don’t know what is going on, apologies if I have trouble explaining what is 
going on here.