[CentOS] users still member of LDAP group after being removed from group 5 days ago

Hi,

Last Thursday I removed users from an LDAP group and today the Linux
command groups still shows those users as member of this group. I double
checked in the LDAP to make sure the users are really removed and also not
part of the local Linux group users on both the server hosting the LDAP
service and the Linux clients.

Could this be related to a cache somewhere? If not cache related what could
be the problem?

Thanks in advance for your help,
Bernard