Lines

Hey there. I am new to the Resin Prints. I have an Issue with my S4u.

i have on the bottom oft the base some strange lines. i dont know why..

i Use elegoo plant Based Standard. 35 bottom and 1.8 layers. calibrated with Cones of calibration v3. Base and Body are Hollowed The Rest of the Print looks pretty good. Not Sure what the Problem is with the bottom. ..