My header Image 'Slider' isn't sliding :-)

My site url https://www.weightlossthehealthyway.com and my theme is ‘Catch Evolution. I set this up before Christmas, last year, and my theme header image used to ‘slide’, alternating between a bunch of orchids and a Buddhist monk at study.
However, I now find that my header image has become static, and it now only shows the studying monk! Also, instead of the header showing the name of my site, it has now changed to show the name of the theme, ‘Catch Evolution’. I’m pretty new at this and would dearly welcome some help to correct these isues.

Best
Ian