Why does git think the file is completely changed?

Question

git

2 people are working on the project, one in phpStorm the other in Notepad++
after saving the file in phpStorm if you start editing the file in notepad++ git thinks that the whole file has been changed, what could it be?
encoding in phpStorm UTF-8 in notpad++ UTF-8 without BOM
UPD: it helped to register everyone in .gitconfig

autocrlf = true
  safecrlf = true

in notepad++ change crlf to lf commit, after that, on subsequent commits, only the changes made are shown.

Answer 1

Options:

• different encoding
  
• different line endings
  

Answer 2

Spaces are used for indentation in storm, tabs are used in notepad++. Or vice versa, or both. In general, pay attention to the indents)