Strange sound glitch while in battle?

[Sinthr]

Hello, and sorry for bothering you guys so soon. D=

 

I'm just curious about something. When in-battle, I experience a strange split-second weird sound effect (like an audio lag / cackle sound) and it usually happens once and when, after the battle but still in the battle screen, I get rewarded EXP or pokédollars. It's nothing serious that I can't ignore, but it is a bit annoying and I was wondering If anyone else was experiencing this somehow or If this is a problem of my PC or something like that.