Hello,
The unicode letters for 'varphi' and for 'phi' are swapped.
Here is a patch correcting this:
diff --git a/lisp/org-entities.el b/lisp/org-entities.el
index 4044432..6f6d054 100644
--- a/lisp/org-entities.el
+++ b/lisp/org-entities.el
@@ -204,9 +204,8 @@ packages to be loaded, add these packages to
`org-latex-packages-alist'."
("upsih" "\\Upsilon" t "ϒ" "upsilon" "upsilon" "ϒ")
("upsilon" "\\upsilon" t "υ" "upsilon" "upsilon" "υ")
("Phi" "\\Phi" t "Φ" "Phi" "Phi" "Φ")
- ("phi" "\\phi" t "φ" "phi" "phi" "φ")
- ("varphi" "\\varphi" t "ϕ" "varphi" "varphi" "ɸ")
+ ("phi" "\\phi" t "φ" "phi" "phi" "ɸ")
+ ("varphi" "\\varphi" t "ϕ" "varphi" "varphi" "φ")
("Chi" "X" nil "Χ" "Chi" "Chi" "Χ")
("chi" "\\chi" t "χ" "chi" "chi" "χ")
("acutex" "\\acute x" t "´x" "'x" "'x" "𝑥́")
Thanks,
Kosta