Yeah true, I agree,
@Latinjazz and
@DJ Yuca. The problem is, at some point it had become popular to write salsa
not using the clave as a foundation (that is to say, the clave was
not being used as measures/bars), instead they would approach writing music in a way that resembles writing ballads and pop music. So there's a lot of going back and forth with those clave changes due to how those songs were arranged.
In fact, the following is one I personally dealt with working in covering music...
Te Va A Doler by Maelo Ruiz from the early 2000s is a great example of what a mess an arrangement can be made into regarding clave, which is why I am not a fan of playing that song hahaha. Even some of the greatest musicians still have trouble with that tune because it simply "feels odd/uncomfortable" to play [due to that song being arranged in a way that does not appreciate the clave]; but its a great example of what I previously mentioned because it just so happens to originally be a ballad, which was then arranged into a salsa tune for Maelo Ruiz (I'm guessing Diego Gale did the salsa arrangement for it??? Do any of you know?).
The main part where musicians usually mess up when playing that song is the mambo section. There's also this strange little bolero bridge/break [in the cuerpo/verse section], and often times singers and the percussion get lost there lol.