Indoor cameras don't choose to play pictures at double speed, and sometimes they play them quickly.

It is a monitoring picture recorded in time-lapse photography mode.

Some monitors reduce the number of frames in order to save memory, and the playback is just a snapshot of time-lapse photography, which is commonly understood as fast playback. (You can even play it slowly, but the frame is missing. If you want to set normal playback, you can look at the software settings, and you should be able to adjust or change the software.