Not a regular game mechanic, you can move forward while singing/playing an instrument. Open your keybindings in options, view all, and see if you have forward also mapped to some other ability, macro, or command. My guess is you’re firing off two commands each time you press that single button.
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[59 Troubadour] Saisu (Wood Elf)
[40 Paladin] Jharu (Erudite)
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