When I remove a symbol from a watchlist, the first time it removes from the current watchlist only. When removing a second symbol, it gives me a choice of watchlists, as shown in the User Guide.
Details and steps taken: Amibroker 6.41.0 32 bit, Windows 10.
Symbols, Select a watchlist, Select a symbol in the watchlist, Right click on the symbol, Select watchlist, Select remove selected symbol(s).
This is not inconsistency. It is context-sensitive behavior. And it is consciously PROGRAMMED to behave this way. If you ALREADY selected the watch list, then it works on selected watch list. If you do not have ANY selected watch list then it asks for watch list to select.