Blocks out of alignment after upgrading to 5.6.1.2

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The alignment of my blocks are out after upgrading to 5.6.1.2.

All the blocks are affected except the header block. They are aligned to the right of the screen for some reason.

Though the header block is not affected by the alignment issue, the font type,size and colour had been changed.

Can someone guide me on these issues?

I'm a stranger to all these web technicalities.

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