WordPress "continue reading" and blog preview not working

This morning while writing a new post, I clicked on the preview and all that showed up was the header of my main page. After checking things out, I also noticed that the same thing is happening when I attempt to click on an article to open it up, either by clicking “continue reading” or by clicking on the Title. Not sure when this started or how to fix it!

Please help!

I know zero about coding so please take that into consideration when advising.

https://oldsinglebitterdrunk.com

Thanks!