Good morning,
I have checked your site and looked at the first image I saw. I can see that this is handled correct by ochResponsiveImages as you can see in the screencapture.
Please note that on first visit of the page, ochResponsiveImages creates the converted responsive images but it will not use them.
on the second visit of the page (F5) you will see that ochresponsiveImages will replace the <img> with the new <img srcset (as you can see in the image).
Also, the setting 'force create cache' will slow you site down because it will on every visit recreate the cached images. This setting you can you if you upload a new image with the same name: it will then recreate the cached files for that image.