VAF distribution of variants with PASS status

<img width="1605" height="505" alt="Image" src="https://github.com/user-attachments/assets/3525948e-2d4b-42f5-8ffc-a465bf467406" /> We plotted the VAF distribution for variants (obtained in Tumor-only mode) with PASS status, and it appears to be germline-like, with peaks at ~50% and ~100%. What could be the reason for this?