Refrech policy window does not seem correct

Very puzzled as to what may have changes recently our continuous aggregates used to refresh with time windows like

refreshing continuous aggregate “cagg_00791f957770100077700000ffffffff_5036_avg_7200000” in window [ 1720936800000, 1720944000000 ]

But of recent the windows looked to have changed to something more like

in window [ -9223372036850400000, 1720864800000 ]
Why would we be seeing more of these minus timestamps cropping up and will it have an negative effect on database performance.