UpStudio slicer makes an unwanted 1-layer raft. What gives?

Need help pls. Been 3D printing for 8 years (started with original UpMini), and kinda know what I’m doing. New problem, UpBox+, Flex board. Now when setting up to print a flat-bottomed object, the preview (and same when printing…), shows in yellow, a one-layer raft, and after printing, it’s friggin’ welded to the flat bottom of the object. NO RAFT is checked in the print parameters. I’ve printed a very similar part before, and it printed cleanly, flat face against the flex board. Here’show it looks in the slicer. Any ideas?? I need to print a lot of parts for a client’s project…!
Thx
Steve