Observation 2905289: Astrocast 0.2 (44083)

Regarding Observation 2905289 looks like the bitrate changed during transmission or something similar. Would that be a reason ?
On https://network.satnogs.org/observations/2904962/ and others there is a very short signal at around 120’’ that could suggest that sometimes an even lower bitrate would be used.

Or am i completely wrong with my analysis ?

73s HB9FXX