I can see, many different way to modeling, as long as there 4 edges, but in this case is it just my way to tweak the vertices which is not good or just this kind of topology which is not adapted to this corner ?
It's kind of hard to understand your question, but your pictures give me a good idea. Looks like the curved corner is deforming. If you want to simplify your mesh, you can try the following.
- Select the vertices marked in red, Alt+M > Merge at Center
- Select the vertices marked in blue, Alt+M > Merge at Center