After update, Stacks layout bugs

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RapidWeaver Version: 6.3.4 - Tesla theme
System Version: 10.9.5
Hardware: 27-Inch iMac .

After updating new stack few days ago, I created this morning new stacks in my home page and it seems the layout doesn’t work anymore, espacially margin settings. It works correctly in the preview in my computer but it doesn’t work on the server.

For exemple, to create 2 colomns, one with a video in the left and text in the right, the 2 columns were one below the other, wathever the settings applied. At last, I was obliged to create my colomns with div, but it was not what I wanted to do in the first place.

the settings are OK in the previous stacks, but not in the new created ones.

Has anyone the same problem ? Is the bug known ? Thanks for answer.