Paypal Buttons Behaving Differently based on Email Program -

i using paypal buttons created paypal button creation tool. button embedded in html email, sent user.

if open email in native email program (yahoo, gmail, etc.) - button redirects correct page , payment can made.

if open email in apple mail, button takes me login screen, or account if happen logged in.

i've checked make sure have copied button exactly, not sure why behavior different or if there can ensure right redirection behavior.