The display of the train formation is reporting the one from yesterday and has been for several days.
My train to work is IC529.
Haltelink shows it as 1896 and 1882 today and 1848 and 1853 yesterday.
Hyperrail shows it as 1848 and 1853 today (indeed it does right now).
When it arrived in Brussels, it was 1896 and 1882.
The same applies for IC417 today.
Haltelink shows it as 1857 and 1847 today and 1841 and 1846 yesterday.
Hyperrail shows it as 1841 and 1846 today.
Many thanks for the very useful app.