The game is a good recreation of flappy bird. However, the score system doesn't work sometimes, and one of the levels is broken
The score increments when you reach the end of a pre-generated obstacle, and sometimes these obstacles include two pillars or triangles, so you only get a point once you pass the second one. I believe that is what you experiences, unless I'm mistakes.
I do agree that this should be reworked though, as I can understand how that would feel confusing and frustrating