Hello. I'm new to 3-D printing. I just recently purchased an used maker bot mini. When I got it the build plate was cracked off in the front I was able to glue back together.and subsequently have done my prints behind the crack line on the off chance the crack seem being uneven

I've done some test prints and I'm getting these warped bubbly prints.but the mirror side of the print it seems to be fine clear and crisp or smooth.
I don't know if I have a damaged unit it's the limitation of the machine or something is not calibrated right.
I've looked through the manual looked at the maker bot website and called there customer support but not seeming to find the answer.
Messed with some the basic parameters of maker bot desktop and I'm still getting these results.try digging online but there seems to be limited resources for the maker bot mini. Any suggestions or ideas would be greatly appreciated. Thanks.