Activating VHT disables my AC7260 Internet

Hi,

I'm experiencing a problem regarding my AC7260 adapter. When i active VHT in HT mode, i recieve a 'No internet access' output, or a 'limited' access I guess. However if i either disable or enable HT mode only i have full internet, is this because of my I-net provider not enabling AC mode?

I am currently using D-link 810L as router, which provides the AC output needed. I have doublechecked the settings for my router. It shows that the 5 Ghz band is sending output in 802.11AC, N, and A

As you can see in the pictures below, the first states that the internet is in AC and N mode

However if i go into details about the connection to that very same internet, i can see it is using the bands 802,11a and 802,11n. How do I make sure AC is here aswell? I assume that is my issue.

Best regards

Mikael