RX100 Exposure bracket question - only two images

Hi. I wonder if any RX100 users have encountered the same problem/issue?

I tried my RX100 for the first time under exposure bracket at both 0.3 and 0.7

Each time only two images came out per shot. one at 0.0 EV setting and the other at -0.3 or -0.7

there was no +0.3 or +0.7

Is my camera defective?

thanks

chong