colormap slider does not work sometimes?

dat = "/home/jovyan/steelelab/measurement_data/He7/Loek/DJJAA_bias_sweep/"
dat = glob.glob(dat+"*13.54*/*.dat")[0]
data = dx.load_dat_meta_txt(dat) 
data["new dataset"] = data[' S21Ph (rad)'].differentiate("Frequency (Hz)")
dx.interactive_linecut_and_colormap(data)

Does not slide properly, probably something with rounding: