All my photos are distorted after 5.5 upgrade

Since upgrading to 5.5, ALL of my photos are distorted. They are stretched vertically.

I have been blogging for 12 years and have 1,624 posts. This is a disaster.

What is going on?

I am using the veryplaintext theme, if that is significant.

The page I need help with: [log in to see the link]

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