Dalaran Heist - Doppelgangster not working

long story short:
got doppelgangster in my deck
got it buffed from bartender bob twice ( once +2/+2 and once +4/+4 and costs 2 more) so it is currently a 7 mana 8/8
but when i played it it was only a 8/8 which summoned two 2/2 “copies” instead of two 8/8 as the card is intended to do
the 1 mana discount in the screenshot is from the treasure

http://prntscr.com/nu021s
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Long reply short: This issue is included in the list of known issues that is posted at the top of the forum list.