There was a previous issue where some commands were getting garbled when executed with the cursor somewhere in the middle of the command. To resolve this problem, a feature was added in PAM 3.2.3 to send the shortcut key Ctrl + E (^E), which brings the cursor to the end of the line for common command line editing interfaces, immediately before sending Carriage Return (CR), the character sent when the user presses the Enter key on the keyboard. This works as expected in most Linux & UNIX systems, however on some systems the default command line editing interface does not support this shortcut. In that case the ^E character is inserted at the current cursor location, which may cause the command to fail. The character is added even when the cursor was at the end of the line already.
Note: It is possible that some accounts have working configurations on the same device, especially if they are using different shells or have customized login scripts.
that some users were working configurations on the same device