Annoyingly there’s a bug in Maplibre Native (the map display framework used by cycle.travel) that does this sometimes. It seems to be triggered by certain polygon shapes. I’m currently working up a fix on the map generation side of things, and with any luck I’ll have something working in a few days. Will update!

I’ve put up a new set of mapping tiles that will hopefully minimise this problem. It’s possible that the app might have the old tiles cached so the effect won’t be immediately apparent (and if you have any offline mapping it’ll need to be deleted then downloaded afresh), but I’m hopeful this will fix it. I’ll keep an eye on it.

Thanks Richard, I'll keep using the app and see how it goes 🤞