fix

mixin/_layout.scss

@@ -20,6 +20,10 @@
   column-gap: list.nth($gap, 1);
   row-gap: list.nth($gap, 2);
 
+  & > * {
+    flex: 1 0 auto;
+  }
+
   @if list.length($bpColumns) > 0 {
     @for $bpIndex from 1 through list.length($bpColumns) {
       $bp: list.nth($bpColumns, $bpIndex);
@@ -33,6 +37,9 @@
           @if list.length($minmax) == 2 {
               $max: list.nth($minmax, 2);
           }
+          $length: list.length($columns);
+          $childs: $length + 'n+' + $i;
+
           & > *:nth-child(#{$i}) {
             @if math.unit($min) == "" and math.unit($max) == "" {
               flex: $max $min min-content;
@@ -60,12 +67,36 @@
               }
             }
           }
+
+          & > *:nth-child(#{$childs}) {
+            @if math.unit($min) == "" and math.unit($max) == "" {
+              flex: $max $min min-content;
+            } @else if math.unit($min) == "" {
+              flex: 1 $min auto;
+            } @else if math.unit($max) == "" {
+              flex: $max 0 auto;
+            } @else {
+              flex: 1 0 auto;
+            }
+
+            @if math.unit($min) != "" {
+              @if $direction == 'row' {
+                min-width: $min;
+              } @else {
+                min-height: $min;
+              }
+            }
+
+            @if math.unit($max) != "" {
+              @if $direction == 'row' {
+                max-width: $max;
+              } @else {
+                max-height: $max;
+              }
+            }
+          }
         }
       }
     }
-  } @else {
-    & > * {
-      flex: 1 0 auto;
-    }
   }
 }