Mesh boundary layer

Why I am having this problem?
I read some articles in Simscale website but could not find anything special.
dddddddddd
cccccccc
bbbbbbbb
aaaaaaaa

the last picture shows that I have a problem on the corner.

Hey there, thanks for using the forum!

Please send a link to your mesh and project so we can have a look at it.

Width-2mm, height 10mm | SimScale Workbench

Did you delete the mesh? I can not find it.