When clicking through the course index under some conditions it scrolls to item you want but temporarily selects the items in the index above the one you clicked and then seems to recalculate and then select the proper one.

This happens with any label like module that has FEATURE_NO_VIEW_LINK set to true.

It appears to happen with any resource which has a short height, and it always happens when clicking on the first resource in a section, so maybe it is related to the height of the item above it as well.