In my quest for a new horse I have been looking up a bunch of usef records and needed some claricication on some class heights....
Open Working Hunter?
Adult Amature Working Hunter?
Open Working Hunter should be 4' (probably a trainer/pro riding the horse)
Adult Amateur Working Hunter should be 3' (probably the owner riding the horse)
Also check out the name of the competition. If you are looking at a breed show record (which will also come up on USEF for some breeds), they may mean something different.
The horse is a Warmblood so I am assuming it is just a regular usef show. And thanks that is good to know