Your watchlist looks different across devices.
You are not on the same account, or changes did not save.
Watchlists are stored against your account on TradingView's servers, and each device pulls the current version when it loads. Two devices therefore show the same list only if both are signed in to the same account and both have refreshed since the change. A page left open for hours keeps showing the version it loaded, which looks like a sync failure but is only a stale page.
The other cause is where the list lives. Changes made while signed out, or in a session that was not properly authenticated, exist only in that browser and are never uploaded, so they cannot appear anywhere else. Named, saved watchlists belong to the account; a list you edited in passing may not.
Make a small change on one device, such as adding a symbol, then reload the other device and confirm the change appears. That round trip proves the list is genuinely stored on the account rather than locally. Check the account name shown on both devices matches, since a second account created with a different sign-in method is the usual explanation for two persistent versions.
Sign in before making changes, and give watchlists explicit names so they are saved as account objects. Reload rather than assuming an open tab is current when you switch between devices. If you have more than one TradingView account, consolidate to one, as maintaining lists across two is a permanent source of confusion.
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