Well, I discovered that this bug also happens in the IR-RB FRAMSTEGN button, so since I didn't have much to do, i started to look at the code and I found this:
I could not find the strings for the INT/KONT switch in clickabledata.lua and when I opened other files to see if I could find it, I saw this one, my knowledge of lua is not very advanced but I think that like the IR-RB button and the INT/KONT switch, they don't have a sound assigned in clickcabledata.lua, the game may be taking the code from this file, and since it does not have a sound assigned, it is playing them all, it is just a theory, but I don't know, maybe it has something to do with all this...
Although it doesn't make much sense either since INT/KONT at without restarting has the correct sound, if it was what I'm saying above, at the start of the mission it should use a sound from the RWR.