I have been running a large amount of POG runs Tier 15. I took screenshots once I started to notice the issue. Once completed the awards provided clearly showed Tier 10 (it also didn’t include the 1.5% minimum rate). I noticed this for the last 55 passes.
I took screenshots for reference

Wave 10 means you completed pog by killing the last 10th boss.Its still Rift 15 rewards I guess.

1.5 multiplier is also still counted .See in Rift they give 100 badges if u complete it perfectly and now multiply it with 30 runs with 1.5 u get 4500.