crease in model when subdividing When subdividing I get a giant crease down the middle of my models face. I'm relatively new to 3D modeling and would appreciate any help that is given.
I have a mirror modifier and subdivision modifier on. I'm not sure what other information I would need to give. If more information is needed please let me know. Thank you for anyone that helps.
This is when the model isn't subdivided.

this is when it's subdivided
Credit goes to Jachym Michal
&quot;Hello :). My bet is on flipped faces: Inaccurate Shading on Object – Jachym Michal 22 hours ago&quot;
It's in the comments, just recalculate normals to face outside, a (selects all) -&gt; Shift-N