Hello together

Since the update to KDE plasma 5.17.1, the desktop plasmoids do not remain fixed where they were set up.
After each restart, the plasmoids jump to any place on the desktop.

Desktop-Widgets in use:
- Event Calendar
- Folder view
- KDEConnect SMS

Operating System: KDE neon 5.17
KDE Plasma Version: 5.17.1
KDE Frameworks Version: 5.63.0
Qt Version: 5.13.1
Kernel Version: 5.0.0-32-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 16 GiB

Thanks for your help!

how to launch said plasmoid?