Last night I had the exact 4 I wanted and played for hours and now today it replaced at least one of them just from me starting the game. I had Speed Demon, Healy Avenger, Chain Gang and Buddy System and it replaced Chain Gang with Laser Fare. It may have changed the others too but I started rerolling as soon as I saw Laser Fare.
Never seen it do this til one of the recent updates. Currently an hour into re-rolling til I get the ones I want back.