Data points don't show up at once and dots don't connect

Hey everyone, i am setting up a graph of my measured download and upload speed but i am experiencing some weird behavior, maybe some is able to help me out.

The graph has many points not connected and the dots data don’t show on hovering:

As you can see the data of the blue line are not shown but the data of the other two.

I use some mysql to make it into time, download_wan, download_lan and upload columns

If it helps at all, here is the snapshot link: Grafana