Girls often stream to multiple sites. It is possible that some missing explicit parts are the result of her being taken pvt or starting a paid show on one site, while streaming it to another site. It is also possible that she hit a goal on one site, and temporarily disabled another site while fulfilling the goal. Some girls try to micromanage things.
Regarding overlays, this is how it usually works:
In most cases, overlays are added in OBS (or similar program) on her computer. For example, Lovense provides
instructions for girls to set things up in OBS. These overlays then become part of the raw video stream that she is streaming from her pc to the various cam sites.
There are few overlays that are applied after that raw feed is sent from her pc.
Sometimes they are hovering over the video on the webpage and are not part of the feed itself. This is only a problem for screen recorders. Even if you're screen recording, you can sometimes get rid of this type of overlay by deleting the overlay element in dev tools. This is a temporary fix that will need to be repeated each time you reload the page.
Some girls have multiple instances of OBS (or similar program) and have different raw feeds uploading to various sites. They have a clean stream without overlays on one site while there are overlays for lovense etc on another site.