Somehow I managed to pickup a third penspear (shown in the bottom right of the first picture) by using ranged grab. Thought it was kinda funny at first, until I eventually got to the Quadblade arena, which I was able to place the first Penspear fine, but then when trying to place the second, the dialogue doesn't give the option to place, only to leave/walk away as though I have not collected the second Penspear.
This has completely softlocked me since slaying the Quadblade is a goal for the main questline.
Thank you whomever may be looking into this issue.