The reason is simple: Iran wanted to save the face and honor of Moqtada, he who joined a lost coalition, so #Iran Soleimani cam "bring him back" to where he belongs
Soleimani tried - but failed - to convince Barzani to select Barham Saleh and drop Fuad Husein so the #Kurds are united over one candidate.
Moqtada turned against Abadi, the US and Saudi Arabia. he is on the other camp now.