OK, what did I do wrong?

Toast
Sourdough rise problem

Was the problem with bulk fermentation on counter top or the time in fridge (14 hour hours) ?

The bulge on the right is just from 2 loaves baking together.... non issue.

30% fresh milled

70% KA bread flour

20% starter 

2% salt

72% water (not including starter)

 

 

I wouldn't use the fridge. Either way the holes can be fixed by less proofing - and/or more handling. If they go away you'll be good. Enjoy!

It's probably the shaping stage. The dough wasn't degassed enough to deflate some large bubbles. During shaping they got moved near the center.

TomP

IMO that is exactly what you want. 

 

If you want fewer air pockets use less starter and or less ferment time.