Hello Joey Gouly:
The KL27 is forced to boot from ROM if BOOTSRC_SEL = 11 and BOOTPIN_OPT = 1. These bits are loaded from FOPT space of the flash configuration field at address 0x40D. Check the chapter FOPT boot options in the Reference Manual for details. Since the value is in Flash, whose erased state is all 1's, then by default the device should boot from ROM. If that is not the case then it means that a custom value was programmed to the address 0x40D in flash.
Check your application's code or the binary just to confirm if something different than 0xFF is loaded to that space.
I hope this helps. Let me know if you have questions.
Regards!,
Jorge Gonzalez
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