Could you verify that a shot is really created every 2 s (file creation date or so)?
Which intervals are supported in interval photo mode?
but here is a single shot
This shot looks awesome!
Did you any post-processing?
How looks horizon levelling, when the mount is not perpendicular? See New Insta360 x4 with 8k video - #12 by Hol_Ger.
I am very excited to see more of your interval photos.