Upgraded 120 heirloom items are showing up on 117 toon as ilvl 61 in Best in Bag function rather than actual ilvl of 267
Could you post an addon export (the string you copy from addon to the website) with one such item?
I’m also doing another update soon with some tweaked item data that we extracted this afternoon. They always slip in a few extra bonus IDs, could be that the ones used by those heirlooms were missing on the PTR.