Whenever you hold your key down to fish for an item the very last few seconds say ( After 5 seconds) Your still holding your keys down . The mouse repositions itself back to a normal mouse. Like an (AFK Mouse)

I think that happens because you've fished something you already have (a title a consumable or a piece of the museum)

Maybe, but it occurs often.

I'll try to reproduce this but this is the same behaviour that happens when what Ifrancesco described occurs.

I've definitely noticed this; it's like I fished up air. I thought it was supposed to happen once in a while though.

I don't like this maybe you can get cheese or something if u already have something like that its annoying.