I'm sorry to hear you are having issues with the content. This is most likely to be a device or connection issue. The lesson run in HTML5 so no specific software is needed for it to function in a browser, although some functionality may be lost in certain types of lessons.
Have you checked that you are running on the latest version of software, as sometimes older versions aren't supported?
In terms of the badges, I have taken a look and fixed the issue with the Thyroidectomy badge, which has now been awarded. I have checked your progress on the practice wide hand hygiene lesson and there appears to be a section you missed, it is the 4th section about "WHO guidelines". Once the lesson is fully complete, the badge will be awarded.
Let me know if you do encounter further issues or if upgrading your software does not help with the flickering.
Elearning and Moodle Developer