Hello.
The Robin plugin only optimizes images. If they are not displayed on the site, then you are doing something wrong with the site, but Robin has nothing to do with it
Hello.
This error means that some kind of output to the browser has been carried out recently before you create a session. Judging by the error, one of your PHP snippets outputs something when the page loads.
It may even be an empty line at the beginning of your snippet code
Hello.
1) Most likely 18 images are new thumbnails of already optimized images. In any case, you need to find these images in the media library and check what is wrong with them. You can also optimize them forcibly
2) Changing the optimization settings will not over-optimize all images. You...
Please clear the logs in the plugin, then create a test post, and send me the logs.
There are too many entries in those logs that you sent me - it's not clear exactly where the problem is.