MegaMan Network Transmission - Wrong music playing

[MetalMaverick]

I've been playing through this game lately and it runs flawlessly from start to finish, but there are 2 particular spots where the wrong music seems to be playing. First is after you beat Zero and get an e-mail from Dex encouraging Lan that he can beat the Life Virus. The hero theme is supposed to play after that dialogue, but for some reason, Threat Arises starts up instead. (the Professor's theme) Then the firewall battle music is instead replaced with the regular Undernet theme. I've tried everything I could think of to resolve this issue, such as switching from XAudio2 to OpenAL, as well as DSP HLE and DSP LLE, but that doesn't fix the problem. After wracking my brain for a while, I thought it could be "Speed Up Disc Transfer Rate" setting being on in the game's properties and disabling dual core, since it seems to be the previous themes that are somehow overriding the places where the proper music should be (i.e. Threat Arises before Hero Theme, and Undernet Theme before Firewall Battle) but that didn't work either. Mind you I had DSP HLE emulation enabled while I was testing this stuff out, so maybe it could've been that. Although I'm tired of constantly playing an hour and a half into the game just to verify if the issue is resolved. (Guess I could've used save states, but whatever) At this point, I just wanna know what's causing this to happen