Most probably because they are not in power or leading the coalition at the moment. Similar positions were held by the once similar parties in Italy before they rose to prominence, and from once bigger parties trying to not vanquish.

Power consolidation is a shared trait of every leading individual or group of people.

And the CDU was pro debt break while in opposition.

Just look at the US, the whole free speech and hate speech is nonsense flipped when Trump came to power.

The AfD is not any different. Just look at Höcke who determines the party's agenda.