My magento acts up weird. I have normall magento caching enabled, but also OPcache enabled on php 7.1.10.
The problem i have is when i load the website in one browser i see the following:
When i look at it in another browser(that previously loaded the website before the cache was cleared) i see the following (it grabs the html of a widget that shows above this one) :

Bonus; when i look at the 'wrong' browser incognito. It shows correctly. So if i'm correct the cache on the browser side isn't invalidated as it should after a cache clear?
How come, and more important. How can i solve it?