voice configurations

Hello, I'm fairly new to UTAU, however I can make covers and I have made a CV voicebank. My only issue is the otoing, no matter how it's explained nothing makes sense to me, could anyone help further explain it? Thank you.

I have decided to open up configuration commissions I will configure virtually any functional voicebank with any amount of pitch layers. The prices below are estimates of my current prices for common voicebank formats. They may be subject to change depending on the nature of the project...

I've noticed it in a couple vb's, but it's particularly noticeable in Ruko's (I almost exclusively use Ruko) brand new .ust I made myself, never used another VB with it, so its not a matter of needing to "fit" to the vb. I've regenerated .frq and have applied G flag and it helps some, but some...

I've tried looking around to see if anyone else had this problem but I kept getting other threads so! Basically my samples(when you click the circles to hear the .wav) in voice configurations won't play for some of the UTAUS I have downloaded, and my own. I figured maybe it has to do with...