Horizontal scroll flexboxgrid-1

[shanksssss]

Briefly ( tweet size ) describe your issue and how you discovered it.

When i trying to use the old version of flexboxgrid1 why theres a vertical scrolling effect and when i resize the browser theres a horizontal and vertical effect? but when i delete the negative margin on the row it fix magically , Is it right to delete the negative margin ?
...

Expected behavior

...

Actual behavior

...

Steps to reproduce behavior

• OS:
• Browser:
• code/fiddle/pen url: