Did you have a data storage corruption or something recently? I did not delete or absorb it into another Adaptive Augment. My Augment Page Shows only one, though. The only ones I get rid of are "defect" Augments and this isn't an alt.
I'd recommend two steps: 1. Report it to support, I think they will give you one back. 2. Open a bug report in Arkham Asylum section of the forums to see if other players experinced the same issue.