New Avator or Profil Picture ist not shown

I changed the Avatar / profile picture after installing
After this I didn’t got the new picture at Mastodon.
@heinrich@muehlenmeier.net
When I check with webfinger https://webfinger.net/lookup/?resource=heinrich%40muehlenmeier.net the answer contains the link to the correct picture:
{
“rel”: “https://webfinger.net/rel/avatar”,
“href”: “https://muehlenmeier.net/wp-content/uploads/2019/06/20190523-P1320702-150×100.jpg”
}
The cache in WordPress ist empty.

hopefully asking for assistance

Heinrich

The page I need help with: [log in to see the link]