Why is everything showing as water?

In this area here near talegaon

(Also any way of attaching frame grabs?)

Everything seems ok to me in this area, at all zooms, viewing with the standard osm display map. I have known errors with coastlines to flood the map with blue inland, but it is usually local. So I suppose it could occur with lakes as well. How far out can you zoom out and still see it?

There was a problem with the tile server that was in use in Australia, see https://lists.openstreetmap.org/pipermail/talk-au/2019-June/012719.html . I’ve no idea what tile server you’re using, but maybe it was the same one?