- Titan mark void impact mod
- Warlock bond void ordnance mod
I've got 4 of each, and they don't show up in the gunsmith to be able to be combined to legendaries. Other mods have been fine.
Some other people (on reddit) are having this issue with the exact two same mods.
https://www.reddit.com/r/DestinyTheGame/comments/8i6p5k/stacks_of_rare_class_item_mods_unable_to_combine/?ref=share&ref_source=link
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Aye, Titan Mark Void Impact & Energy Counterbalance for Legs