Thanks for clarifying that.
Kodi seems to think the streams are 50fps:
CRenderManager::Configure - change configuration. 1920x1080. display: 1920x1080. framerate: 50.00. format: AMLCODEC
If they’re not, this is going to cause problems.
A sample of the stream (without transcoding) would be quite useful.
You can also list any affected channels and I will check with some other DVB-T2 users in Germany who may be using TVHeadend and be able to get a raw capture.