What's wrong with Blender? Why the selection is... wrong?

Artwork Animations
1

This is definitely a bug.https://youtu.be/zxNt9UymlZU
After I select some vertices inside wireframe mode, it looks like there are overlapping vertices, but I tried to merge vertices by distance and it removes no vertices. However, the selection is normal in other mode.

2

I tried to add a new cube and select its vertices in wireframe mode, it is alright, so it’s the models problem?

3

do you have any modifiers on the problem object? In particular, a subdiv modifier?

4

Maybe mirror modifier is creating double vertices. Is your model only one side ?

5

Screen Shot 2020-07-21 at 9.06.10 AM
Screen Shot 2020-07-21 at 9.06.10 AM1440×900 255 KB

No, no modifiers.

6

I found the solution. I just need to do a shade smooth. How stupid I am… It still looks a bit weird, but I think it is acceptable.

Screen Shot 2020-07-21 at 9.12.08 AM
Screen Shot 2020-07-21 at 9.12.08 AM1440×900 256 KB

Sorry for the late reply because I am in Asia and I sleep a lot.