Same here from multiple users - it's the Avast Online privacy chrome extension that is flagging the site. No details provided. Gives the alert. Number shows 1 next to Avast extension icon then clears back to 0 when it loads the alert page.
From browser field: chrome-extension://gomekmidlodglbbmalcneegieacbdmki/common/messagebox.html?data=eyJ0eXBlIjoibWFsd2FyZSIsInNhZmV0eVVybCI6Imh0dHBzOi8vd3d3LmF2YXN0LmNvbT91dG1fc291cmNlPU9ubGluZVNlY3VyaXR5JnV0bV9tZWRpdW09cmVkaXJlY3QmdXRtX2NhbXBhaWduPWF2YXN0IiwiYnJhbmROYW1lIjoiQXZhc3QiLCJvcmlnaW5hbFVybCI6Imh0dHBzOi8vd3d3LmxpbmtlZGluLmNvbS9mZWVkLyJ9