it almost sounds like only the first actor to receive the input is handling it & the rest are not even getting the chance. Unreal can be a little picky with input handling across multiple actors especially when Auto Receive Input is set.
Instead of relying on each collectible to directly receive player input, have you considered using a single input handler (like your player character or a controller) that does a trace or overlap check to see what’s interactable in range? That way, you are centralizing the input and deciding what should respond rather than hoping each actor picks up the input on its own.
Good Luck