At Login, Cookie's window remains open

[nunz]

macOS Sierra 10.12.6
Cookie 5.5.7

In Cookie's preference pane, I set the option under Display > At Login to
(1) Open Cookie at Login
(2) and Hide

Despite the Hide option is enabled, upon starting my Mac, Cookie does NOT hide itself and its window remains open. This has become annoying.

Is there a fix for this so that Cookie launches at Login but hides itself?

[SweetP]

if you open:
System Preferences
Users & Groups
Login Items

then make sure that Cookie is NOT listed.
that should fix the problem