I don't know when it actually happened or what caused it, but normally when Mario climbs a fence you can hear the sound of him climbing but upon testing my levels recently I've noticed they don't make any. What could have caused this and is there a simple way to just 'reset' the sound effects in the game?

Thanks!

You have to select a sound set that contains the fence sounds.

For sound sets you can have a look at this list: https://nsmbhd.net/thread/1877-sound-set-list/

Fence sounds are in group 6. Sound sets that contain that group are 39 and 45.
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GitHub - Kuribo64 - YouTube

Okay I did not know it was possible to change the sound sets in the editor! I used the W3-Tower as an example an set my level's sound set to 27 and it worked. Thanks!