First of all, thank you so much for your reply, Dr Who Fan.
I now understand that I messed up big time.
1) I checked that all projects have the same user-name, maximus73
2) All projects have the same email address _______@gmail.com
3) On World Community grid I changed my username from max73 to maximus73 to match all the others. Now i can only login with the new username.
The problem is that on 22/12/2018 when I saw 77M points missing due to the authorization issue with Einstein@home, I did not understand that was the cause,
and instead I tried to solve a split CPID problem that was not there

, by replacing
dc0d3a89dbe479ad3f20ab109597491a with e338750334f56d4aac2e8573135e2318 in the client stats files.
In fact the CPID reported in all project sites was the e338 one, so I thought there was an error on my client. Instead this must have created a new external CPID = dc0d3a89dbe479ad3f20ab109597491a.
The authorization issue with Einstein@home I fixed it later on that day.
What to do now?

I thought if I add all the projects to BAM things would fix by themselves but unfortunately I cannot add POEM (350M points) to my projects in BAM because it is a retired project.
Now the situation is as follows:

New CPID: dc0d3a89dbe479ad3f20ab109597491a, maximus73 which is my desired username
This CPID was created on 22/12/2018 by mistake probably on my part.
This CPID NOT stored in the client state files anywhere on my PC (only have one host)
New CPID projects I do care, all : 852M Einstein,GPUGRID, WCG
Old CPID: e338750334f56d4aac2e8573135e2318, Massimo username which appeared out of the blue on 22/12/2018
This was the only CPID until 22/12/2018, and showed maximus73 as username until then.
Old CPID projects I do care : POEM, credits =350M
Old CPID projects I do not care: Asteroids, LHC, MilkyWay, PrimeGrid,SETI
I guess I won't do anything anymore unless I know exactly what I am doing

!
Cheers,
Massimo
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EINSTEIN @ HOME
====
maximus73
Account information
BOINC user ID, 641210
Drupal user ID, 31680
Account key, 032b534272b1d22b0ff9e9ae7dda149e
Weak account key, 641210_f0ad933284bc0901efa5209bac2fcdf3
Cross-project ID, e338750334f56d4aac2e8573135e2318
GPUGRID
====
Name maximus73
GPUGRID member since 26 Aug 2013
User ID Used in community functions 99149
Weak account key 99149_a9b34236ff2430c0e1f49102f72b604b
WCG
====
The following information is useful for attaching devices to World Community Grid:
Project URL:
www.worldcommunitygrid.org
Account Key: 48278611ec90f6bb7f1ced22cebc602a
Weak Account Key: 23338_75f9c8b4f1ad351edc2317a1e7de8ecc
The following information is used on websites that integrate with World Community Grid:
Account Number: 223338
Cross-Project Id: e338750334f56d4aac2e8573135e2318
External Authorization Code: 9b291ccf090c8a1602b997119ed6a9e9