Ah this seems to have solved it thanks a million!

For what it's worth I seem to have the same problem with Bizhawk too

The reason I've been looking at using Nestopia is that its the least computationally intensive out of all of them. My laptop is pretty crap and with emulators like FCEUX or Bizhawk I tend to get a decent bit of lag

I seem to have the same problem with that version. It's hardly an intended feature is it?

I recently downloaded Nestopia UE to run the game after finding out that Mesen is not a valid emulator and I seem to be running into an issue that I didn't have with Mesen. If I jump without holding right then hold right in mid air it cancels my jump. Originally I thought it was a problem with l+r but even when I enable l+r the same problem happens. If anyone has had this problem before I would appreciate any help possible.