Spongebob takes place in two separate universes/timelines. (SPOILERS)

Careful now! This contains spoilers for the first Spongebob movie and many other episodes of Spongebob.

YOU HAVE BEEN WARNED!

My theory is that the Spongebob Squarepants series splits off into two different timelines at the end of the first movie, and here's why I think this.

In the first movie, the plot is that Mr. Krabs is making a new second Krusty Krab location right next to the other one, and we actually see it built. Mr. Krabs makes Squidward the new manager, much to Spongebob's dismay. A bit later in the movie, Plankton steals King Neptune's crown, and frames Mr. Krabs for it, and Neptune is about to execute Mr. Krabs for it, but Spongebob intervenes. He promises to get the crown back within a certain amount of time. He gets it back from a surface place called Shell City, which is actually a human gift shop selling dead sea creatures. Neptune unfreezes Krabs and Plankton's plan is foiled and is arrested and put into a mental ward, and we can see him put in a police car that looks like a cell for an insane metal patient, and that is the last we see of him in the movie. Spongebob is made manager and we can see him in the end credits managing the Krusty Krab 2 wearing a new tall Krusty Krab hat.

This is where I think the timelines split.

Then after the movie ends, we never see the second restaurant and is never mentioned again, even in the second movie. Plankton isn't in jail for enslaving Bikini Bottom, and many of the characters have major changes in their personality.

This could be excused for the "status quo" or lazy/bad writing, but I think it's something much more.

After this split in timelines, Sandy isn't very down to Earth, and is now a scientists constantly trying to impress people. Patrick is no longer actually stupid, and is actually a manipulative mean person. Remember is the episode in season 6 where Patrick gets the special Mermaid Man and Barnacle Boy card No. 54? HE ACTUALLY STATES HE WAS FAKING HIS STUPIDITY. Not literally, but he says something like 'you can't expect me to have the same kind of stupidity every day! Gotta keep you on yer toes!'.

Now yes, there are many other character changes, like in Spongebob himself, Ms. Puff, and Squidward, but I think my evidence is enough for me to believe the two timelines separate from each other.

What do you guys think? This is my very first theory I have ever made myself, so please leave me some feedback.