The rules for the level leaderboards state that there are no glitches allowed, but doesn't state wall hoping and high jumping. Both these are allowed in runs, and I have seen them used in verified runs. Are they exceptions to this rule as they are more like bugs rather than glitches or anything?
high jumping is an exploit, also known as a physics bug with roblox. I would say wallhopping is a glitch but fe2 runs say that wallhops aren't a glitch and there are runs that use wallhopping there. So high jumps aren't glitches, but wallhopping is questionable.
Since more and more players are starting to optimize the boards, wall hops are now allowed. However, lagging your game to do tricks like lag high jumps, or any sort of clipping will stay banned.