Broken Mystic Forge?
I have tried around 8 Exotic, level 80 combines over the last few days. On different characters. All level 80 items with all weapons, all armor or a combination. All I have gotten back are level 76 (1@78) common Exotics. They should have all been at least level 80s as average of 80 = 80.
Alas, there’s an exception for exotics that might be L80 in other circumstances. The stated goal was to ensure that the output would have more variety in terms of skins (L75+ has a couple of extras compared to L80s). The practical effect is to reduce the profit from forging exotics.
This ‘feature’ is documented on the wiki
In addition, the output equipment will be 3-12 levels higher than the average of the levels of the four pieces of input equipment, except for exotic weapons or armor averaging L75 or better, in which case there is a chance of ending up with L75-80 weapons or armor respectively.
Thank you and F me.