My guess is that the DefaultSM-FLAT-PATTERN is "out of sync" - happens a lot . . .
Some people will switch to the Flat Pattern configuration, and some will use the "Flatten" command.
If you do both, your "flat pattern" configuration could show a bent part (in the model, and on the print)
Switch to the DefaultSM-FLAT-PATTERN configuration, and verify that the "Flatten" command is activated.
You will then want to switch back to your "Default" configuration and verify that "Flatten" is not activated.
Happens a lot . . .
Could you attach your file?