I don't know why when the hostages are supposed to go to the helicopter, they stay still near the tent. I tried disabling all mods except the required ones, but the result doesn't change. This prevents me from completing the mission. I tried several times but nothing.
Could it be caused by one of the DLCs?

There's is no DLC requirements. While the scenario uses assets from DLC, you can still play it.

As for the hostages, When the helicopter landed, the hostages are supposed to go board the helo. Until then, they will stay still inside the tent. As long as the CAAF officer boards the helicopter, the rest of the hostages would teleport inside.

Multiple playtest has them board as intended. Unless you use AI mods, as it would break this behaviour.

I'll slightly adjust his position. Thanks for the feedback.

Problem solved. I replayed the mission disabling all mods except the required ones again. I also disabled the optional DLC and the mission didn't give me any problems and I managed to finish it. I hope to see the Red team in action again.

Thanks for the heads up man. Happy to hear that :)

A slight note: Mods like Hit/Death reaction, Project SFX, and such wouldn't really affect the mission flow in my playtests. So feel free to use them.