Dataset detrended flux error

[suman-phy]

Hi, I'm facing an issue when plotting the detrended flux from lmfit (plot_lmfit, with detrend=True), where it gives an incorrect plot. However, with detrend=False, the plot doesn't have any issues. I found the same error when I used 'cds_data_export' to export the data and plot myself. I've attached the figures without (1st) and with detrending.

I didn't have this issue when I used the same function a few months back. Not sure sure if updating the package or dependencies has affected something here. I'll really appreciate if you can help me with this.

Thank you.