[CoursePress Pro] Course press pro does not login after logout process (in multisite)

This is the issue we observe from both sites using coursepress in a multisite :
1. we press the logout button (from coursepress)
2. Looks like the logout process has worked out
3. When trying to login, a message appears saying "user is already logged", which is not true.
This is a big problem for our clients, because they have to clear the cache to be able to login again and access their course.
When using the wordpress login (using wp-login.php), everything works fine, but this is not what we are expecting from your plugin (and is wished for our user experience).
The problem appeared after update in fall 2017