I don't know why this weird behavior started to happen, I never seen this before.

Maybe that is because I upgraded of Visual Studio, I don't remember any different thing I did before the breakpoints started to get lost and often acting bizarre: they are moving randomly over time (fast. in seconds. maybe after builds) and, if I try to delete one of these breakpoints, the editor deletes and moves the focused line to lines away. So frustrating.

The bizarre behavior stopped after I manually deleted all "obj" folders (Clean Solution won't work to this).