The fee for the 2nd Right of Interment is a standard charge because the purchase of the original grave space only has one interment right. (Which is just the right to inter 1 person.) So, this one is fine and it is not at all related to the fees for the burial.
As for the other two – there is typically just one fee for the burial. This is the actual labor charge of burying the cremated remains. I do not know why there is an “initial” AND a “final” – it’s generally just one charge. The burial involves opening the grave (digging the hole for cremated remains) and closing the grave (filling the hole in with dirt and either replacing the sod or planting grass seed.) The only thing I can think of is that they separated the charge for the “opening” (initial) from the “closing (final). That’s an odd thing to do in my experience as it is usually one charge for “opening & closing” (which is also known as interment).
I would ask the cemetery to explain why there are two fees for the actual burial.