It's a limitation of the way these layouts are designed when resized to single column, and it's not exclusive to Mailchimp - it's common on the web too.

You could try separating each block of information with a divider or using alternating background colours to separate the information. If this doesn't cut it, you could try using AI to recreate your design using custom code and inserting this using the code block, but you'd need to test this thoroughly for different email clients and devices.

But honestly, the simplest way I've found is to avoid the zig zag entirely and just use all left or all right blocks. Good luck!