WordPress inserts large area of unwanted free space before a Post

Please help me understand why each new Posts (post or page) has an an wanted large area of white space inserted before content

1 .I have tried editing, deleting content

2. Tried new post and Pages

3. Also created new admin user but issue persist

Please see https://www.rock-solid-reviews.com/blog/ for visual

Thanks in advance for your help

Phil

P.S. I am guessing it may be a css issue?