This problem was discussed here: 9.2.2 DVB tbs driver / Hauppauge USB wintv dual HD / Tvheadend conflict
Brief, something with Hauppauge WinTV Dual and TVHeadEnd is wrong (I think it’s about kernel’s drivers).
If you’ve also the August try to remove the Hauppauge and use only the August to see if it works.
For a fix I think we should wait for next release, because adamg is aware of the problem so I think the team should fix it in next release.