Yes it is different.
If I activate this module on the Homepage, then it works normally.
Have you an idea, how I can solve this problem?
Until Joomla 3.7.0 the Masonry-module worked in the old version perfectly, the first problems I had with the old plugin-version with an update to Joomla 3.7.3.
For Joomla-Update 3.8, I have installed the latest Vertex-Update to 4.2 and the Plugin-Update to Version 2.9.1 whit this effects described above.
Many thanks for your help.