Whats wrong with my Staging?

[fiery breach]

where are these side decouplers?

[peak dagger]

post a close op of the decoupler. and radiatos dont help agains reentery heat

[inland sedge]

if i had to guess youre booster is most likely just attached to the main rocket not the decoupler

so maybe just double check that

[vernal ruin]

Word, ty