Roaming Throne
Possibly related to another bug reported here "Preacher of the Schism Trigger Bug" , since I had two Preachers of the schism out, I got a roaming throne and a Sheoldred in play with a breach the multiverse and named Phyrexian. I attacked with the two Preachers which normaly are Vampire Clerics and they triggered twice each creating 4 total vampire tokens, while and most importantly there was a blue letter addition next to their type of Phyrexian. So they had become Vampire Cleric Phyrexian, and this is why they triggered twice. The bug is that they should not have been able to get an additional type. So I believe it has something to do with Preacher treated as a Phyrexian, or Throne making all other creatures the chosen type.
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Rezzahan#77802 commented
Breach made all your creatures into Phyrexians. It's its last line of text, and that effect lasts indefinitely for all your creatures that were on the battlefield at the time.