Hello [mention removed]
Thanks for bringing this up. This seems to be a known issue, tracked here: UE-52800. It happens on Windows touchscreens where a single tap fires both a Touch 1 and a Left Mouse Button event, leading to unexpected behavior like double-clicks just like what you’re seeing.
The issue is marked as “By Design,” which reflects how the engine currently handles touch input on Windows. It’s also listed with a target fix in 5.3 but unfortunately users in more recent versions are still experiencing this even in UE 5.4. Epic is aware of this issue and any update should appear in the link I shared.
In the meantime, a workaround that’s helped other users is to use a Do Once node when the click is detected, followed by a short delay to reset it. This ensures the click logic only runs once per tap. This approach was discussed in this forum thread where other users faced the same problem: Unreal perform double click on touch - Programming & Scripting / UI - Epic Developer Community Forums
Please let me know if this information helps.
Best,
Francisco