Stuck In the Loop [Part 1]

Unexpectedly, the test chamber that you were going through got stuck in a loop. Can you figure out what's going on and how to fix it? This is a map with a custom plot, divided into several parts. The test element of the map is not confusing and quite simple. Difficulty: even a moron will pass. This is my experimental map where I decided to use 'linked portal doors' to create unusual 'superliminal' puzzles. This part is an introduction, so I decided not to bother with puzzles, but decided to introduce this mechanics. I hope you like it, if you want to suggest something to add in the next chapter, go ahead!