Can't get contact to 28" wheel in 28" hole

Hi everyone,

I just got the Flow and ran into a problem setting it up. When I use the 28" holes in position one, there barely is any contact between the machine and the wheel. If i continue adjusting the distance further more, the screw falls out of its counter piece. I now started using the 26" holes, though there is barely any clearance between the wheel and the machine, when it is not attached yet. Has anyone had this issue as well?

I use Vittoria Zaffiro Pro Hometrainer tires (ETRTO 23-622) and measured about 680mm diameter (roughly). 

This is the 26" setting on the 28" tire when loose:

I also did a little video for the german Garmin support. It is in German, though:

Thanks in advance,