That sometimes happens to note types because Anki is finding ones that have the same name, but it cannot be sure that they are exactly the same. But I haven’t seen that happen with decks.
Do those new plus-decks have any cards in them?
If you delete them (or empty and then delete them), are they recreated on the next sync?
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It was empty and after I deleted it and synced again it didn’t seem to come up.
Also I use ankidroid, not sure if this is caused by ankidroid having a conflict with desktop anki.
That’s good that it didn’t repeat. My suggestion would be to get your devices completely in sync (that means 3 syncs, decktop-droid-desktop or vice versa). Then run a Check Database on one device to clean up any stray data, and force a one-way sync from there to AnkiWeb, and receive that one-way sync on the other device.
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I’ll try it. Thanks!
It will happen if a deck with the same name is added to multiple devices without syncing in between.
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