Collection of pictures showing sourdough bread with different problems and the possible reasons for the problems.

I have sourced the pictures and the reason suggestions from a sourdough facebook group, I am a member of.

Bakers attic

What :

Space between crumb and top crust.

Reason : 

Sourdough starter is too weak.

Under proofed.

What :

The bread is raw in the middle.

Reason :

Maybe the starter was not strong enough.

Maybe not enough bulk fermentation.

More examples :

Tunneling is a symptom of under proofing

Big holes close to the top is a symptom of under proofing

Severe case of underfermentation.

Underproofed maybe because of the cinnamon which inhibits fermentation.

Underbaked

What : 

Dense spots around the middle.

Reason :

Maybe baked to short time.

Maybe baked with too low a temperature.

In addition the dense cumb point to under proofed (either too short proofing, too cold environment or too weak starter)

Gummy and underbaked. However, could also be underproofed.

Overproofed

What : 

The bread have had no oven spring and is flat

Reason :

Maybe the dough have been proofing too long time typically second proofing on the counter instead of in the fridge.

Maybe too little Stretch & Fold so that the gluten have not been developed.

Blowout

What : 

Steam & gas created inside the bread creates an unwanted blowout then trying to escape.

Reason : 

Maybe no scoring or scoring not deep enough.

Maybe the crust hardened too fast for the inside steam to escape through the scoring, which can happen if there is no steam in the oven to delay crust hardening, eg. if not baking in a DO.

Uneven or under ferment

What : 

A few big holes typically at the bottom of the bread and otherwise only small holes.

Reason :

Maybe uneven distributed yeast.

Maybe underdeveloped or overdeveloped leaven.