Invocation Blessings Bug

Hello, I have 2 stacks of 99 invocation blessings and 1 stack of 37. I equip the stack of 37 to my potion tray left slot but when I change instance the game swaps the 37 out and replaces it with the stack of 99. When I pray it creates a new stack instead of adding to the stack of 37. Not sure why this is happening but it does seem like a bug. I haven’t check to see if it happens with other items in the tray or not.