Do you have a "Before" Photo to compare it to? Dermal Filler injections do not cause unnatural curvature, although I suppose if one side has more filler than the other, it can give it the appearance of some curvature.
I do need to post this where more people can see because I feel it's important for everyone to know that you'll almost never have a "One & Done" session with filler injections. I would go as far as saying 99% of Progress Reports indicate at least one follow-up appointment because of the near inevitability for touch-ups (or to add more Girth).
The penis is a dynamic organ (it changes shape, temperature, and position throughout the day), making it predisposed to some (unpredictable) irregularities. Typically with good injectors you see less of this issue, but inevitable nonetheless. Also, part of the end-results depend on the patient following the post-op protocol which usually calls for massaging (which I'm assuming you did?).
Additional photos will help. I believe what you are pointing out is fixable for sure.