We just rolled out a new, experimental frontpage mechanism. This change affects guests (non-logged in users) and logged-in users which are not subscribed to any subverses. The new mechanism will become available to everyone else through user preferences and it will be opt-in only. This means that you will have to enable it if you want to use it, otherwise you will not be affected.
This was discussed here last week and for the time being this is rather experimental. The old voat frontpage mechanism works ok but only if all default subverses have equal level of activity (new posts and total votes). As some subverses have become more active than others, their content flooded the frontpage and pushed content from other, less active subs out of view.
If you are a developer and if you would like to dig in the source code of this change to see what we changed, this is the changeset.
Please report any issues with this if you notice any.