Attached is FSC curves from the auto refine, showing an inflated curve. I've tried with setting the "search range X/Y" from default value (39) to something small (e.g., 20, 10, 5), but the same issue occured. The particles were auto-picked in cryoSPARC and importated into cisTEM for ab-initio reconstruction, which looks ok and almost same with cryoSPARC's. It's not a helical reconstruction although the particle is a bit elongated (~260A largest dimension vs. ~120A smallest dimension). The circular mask doesn't cut the density in the refinement panel.
Thank you in advance for your advice and I look forward to hearing from you.