Sorry if this has already been posted!
Weighed pressure plates are having these glitches where the same amount of redstone output comes from 1 block or a stack.
Also, if you throw a item/block of another kind the signal will increase
Steps to Reproduce:
1. If you throw one block onto a weighed pressure plate it will give off 2 blocks of output.
2. If you throw one again you will see it goes to 3 blocks but then back too 2.
3. Then throw a stack on there and the output will still be 2 blocks.
Weighted pressure plates count entitites. 1 Stack = 1 Entity.