The bottom is supposed to be flat and is what was attached to the print bed. what could be causing this amount of warping?
Heat, or rather lack thereof. The bottom cools too much and curls up towards the hotter newer layers.
Depending on the material you are printing with, you may need better adhesion, a hotter bed, an enclosure to keep the heat up, or a brim to help things stick down.
Really don’t have enough info for a better answer.
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Wow, that’s I guess the strongest warping I’ve seen! Adding to @TK4132 - this page lists a few more details and tipps (focusing on ABS - is your material ABS?):
It may help to heat up the bed before printing and let the machine sit heated for half an hour or so. This gives the whole environment time to be warm.
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Can you give us a picture of the 3D model? It looks like the upper wedge shape is part of the actual model. making the warping look worse to us.
im with @Hauke that’s a heck of a bend.
for me with abs the bed temp is at 100. i use the controls to preheat the bed for a half hour to give the whole bed a chance to get warm and not just near the sensor. i also do this before any bed leveling. i always use brims for the prints. always use alcohol (90% or better) to clean the bed. ive also had some abs that simply didn’t stick well without help. which has been aquanet hair spray extra hold on the bed.
other things to think on. as you can see abs has a strong pull. once your print starts lifting from the bed your print is done. it won’t get better. for you it took about 20mm for the cold part to hold the top layers which allowed the top of the print to finish. it is worth the effort to dial in the printer for your material. things like z-offset can determine how well your print flattens to the bed.