<tl;dr> Update on 2017-03-31: This is due to corrupted data in Wikimedia Git. There is no issue in Grimoire code. We will not fix this. See T123643#3143480 for more info.
Probably another artefact related to T119755:
There are six IDs all with the very same email address of ttijhof, but with names of other people. They all have "scm" as their source:
d3af6e4d2efc077a6efa26aa0b3c9511504d18a8 e891edbbfc7a9f3f7b2027cfb9de44e35d16cfb9 136155e528cf630d61a8352ab1a80ae2ddbc7a03 3f893381f154b7a05b4c1271cdc413c3291e15f0 4db496181f424e564fb692aadaab97fdbec793f9 a8f40dc4f3f4f6f7e15ce6c604e3f96ede41976d
As @Lcanasdiaz wrote via email,
Those people where grouped in a single identity a few weeks ago. Yes, something strange happened in the past with that accounts and the result of our matching process seems a bit confusing. Besides that Alvaro has just told me we had issues with that identities two years ago, before the sorting hat age! So, we'll have a deep look to identify clearly the reason.