Hi,
I find the DNA Plugin NextValue attribute will automatically added every time for same uid.

version: 389-ds-base-1.3.8.4-15.el7.x86_64

This is the server side configuration:
dn: cn=uidNumber,cn=Distributed Numeric Assignment Plugin,cn=plugins,cn=config
objectClass: top
objectClass: extensibleObject
cn: uidNumber
dnaType: uidNumber
dnaMagicRegen: 99999
dnaFilter: (objectclass=posixAccount)
dnaScope: dc=example,dc=com
dnaNextValue: 5007
dnaMaxValue: 9999
dnaThreshold: 200
creatorsName: cn=directory manager
modifiersName: cn=Distributed Numeric Assignment Plugin,cn=plugins,cn=config
createTimestamp: 20190822054416Z
modifyTimestamp: 20200619040000Z

User attribute source is Windows AD, I have nsDSWindowsReplicationAgreement which sync posix attribute from AD to 389ds.
When I fill magic number 99999 on AD side, user will get a UidNumber through DNA plugin. For example, an user get a uidNumber 5007 for the first sync, when I update user entry attribute(add telephone), this user will get a new uidNumber 5008 for the second sync.
I don't know whether this is normal.

Sincerely,
--
DaV