On my XA2 I reboot, it gets to themed login screen, i input the passcode, and it boots into the themed desktop.
On my 10IV I reboot, it gets to a black login screen, i input the passcode, then it takes you to the themed login screen, i input the same code again, and it boots into the themed desktop.
Is this normal on a 10IV?
Yes, it’s normal. The first passcode is for decryption the user data partition, the second is for the “regular” use. It looks like your XA2 isn’t encrypted.
thank you.
think my XA2 was done in the 3.1 era.
Do you mean III? Â
Yes i do. 
Apologies.
While it is normal for current SFOS, actually, it is not normal at all!
The pasword is the same, so J should just cache the password for the second input in time-expiring keyring. As linux’s cryptsetup already does.
PS I’m not even talking about possibility to have different passwords for LUKS encryption and unlocking, which, too, was asked from J.
I took the liberty to change the title to lessen confusion among readers 
You also have to add to the input “passwords” you have to type after a reboot the PIN.
In general the whole experience is not that great. Ideally you should only need to enter a password once.