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Something is adding parameters to the URLs of your images that are not validly formatted in the RSS feed. This is probably caused by a plugin you are using. My advice would be to disable plugins until the feed is valid. Start with Jetpack and the Siteground Optimizer.
Thank you very much! I turned off some photo settings in Jetpack and things are back up and running! Thanks @threadi
Glad if I could help. You are welcome to set the topic to solved.
Note others: shut off the photo caching/fast loading options in Jetpack if you’re having this issue.