it's possible that the loader still has "wbfs" in it's cache. when you try to launch the game from FAT32 it's still triggering the WBFS driver.
you might have to force a partition remount : settings > hdd settings > click on the first item on the list to force a partition refresh.
it's also possible that it's not the issue, but sometime it could be just that.
your syscheck :
IOS222[38 Info: her ES Identif NAND Ac USB 2.0
IOS223[38 Info: her ES Identif NAND Ac USB 2.0
IOS249[38 ES Identif NAND Ac USB 2.0
IOS250 (re ES Identif NAND Ac USB 2.0
BC v6
MIOS v10
Report generated on 03/29/2017.
Your IOS in slot 249 is based on IOS38.
I couldn't see which version you have, but you should replace it anyway so you are sure to have latest and correct version.
What you need :
slot249 :
d2x cIOS v8 final, base 57
OR, the common setup:
249 : d2x cIOS v8 final, base56
250 : d2x cIOS v8 final, base57
the default slot is 249 for USBLoaders. it will use a "base 56" which is very slightly faster than base57 (you might not even see a difference in load time).
base 57 has better compatibility than 56.
So, either you install base57 in slot 249
OR
you install both but set "slot 250" in your USBLoader settings as default slot.
that's a little unnecessary steps. but it's like you want.