I posted about this in Spanish forum a few months ago, but it is still happening.
The satellite animation, when it reaches the prior 15 minutes, shows the future forecast animation instead of displaying the last 15 minutes images. Though this is hard to notice at first, it is more noticeable in fast moving clouds, as the animation is erratic, unlike the real historic data. This makes us to only see 45 minutes of the real satellite image animation. This happens on desktop and Android, not sure of iOS.
Hope you understand what the issue really is, if not I may further explain.
