I'm coming back to the game after taking a break and I decided I wanted to upgrade my Outbreak Perfected only to not have the catalyst for it. I remember doing the mission "Zero Hour" twice to get the weapon itself and the catalyst and remember finishing but not actually completing the catalyst. I've been looking for the catalyst and could not find it, so I went back to the forums to check my D2 profile and to see that I actually did the mission on 2 separate occasions, the first 2 missions I did I had to restart because of something I can't recall what, but its clear I did it twice and doing the path to get the catalyst. I'm not sure if this is a bug or something but I really wish I could get the catalyst back because I'm not sure if I can at the moment.
https://gyazo.com/8fa9a257026762f69c3fe199b7e82311
https://gyazo.com/9a061915325db6f62b5232f47fd2fc02
https://gyazo.com/57a8f8dc86d2530ced07e8e0d3d1e50b
https://gyazo.com/4464e2d4cdfd69eac0d7530da3b960bd
Matches:
https://www.bungie.net/en/PGCR/5954500557?character=2305843009403298823
https://www.bungie.net/en/PGCR/5954643833?character=2305843009403298823
https://www.bungie.net/en/PGCR/5954778491?character=2305843009403298823
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According to dungeon.report you only had one full completion on normal difficulty and never completed heroic. The other two Zero Hours listed you saw are most likely attempts.