strange behaviour of find -iname

[address@hidden]

   Hello!

   I am not sure this is a bug, but I fail to understand why find -iname
   works differently according to the directory where I want to find
   something...

   Regards

   René

   I am using Linux mint 18 Sarah

   address@hidden /home # pwd
   /home
   address@hidden /home # whoami
   root
   address@hidden /home # find -iname *astrill*
   ./wergo/data/internet/Link to astrill
   ./wergo/storage/setups/done/astrill-setup-win.exe
   ./wergo/storage/windows_programmes/astrill
   ./wergo/storage/windows_programmes/astrill/astrill-setup-win-v3.exe
   ./wergo/storage/windows_programmes/astrill/astrill-setup-win.exe
   ./wergo/storage/linux_programmes/astrill
   ./wergo/storage/linux_programmes/astrill/latest-for-installation/astril
   l-setup-linux64.deb
   ./wergo/storage/linux_programmes/astrill/20150218_astrill-setup-linux64
   .deb
   ./wergo/storage/linux_programmes/astrill/20180327_astrill-setup-linux64
   .deb
   ./wergo/storage/linux_programmes/astrill/20160815_astrill-setup-linux64
   .deb
   ./wergo/storage/linux_programmes/astrill/20170625_astrill-setup-linux64
   .deb
   ./wergo/storage/linux_programmes/astrill/astrill-setup-linux64.sh
   ./wergo/storage/linux_programmes/astrill/20160906_astrill-setup-linux64
   .deb
   ./wergo/Downloads/AstrillWebRecorder
   ./wergo/hardware-and-manuals/Zbook harddrives on 20141112/astrill
   ./wergo/hardware-and-manuals/Zbook harddrives on
   20141112/astrill/Astrill Setup Manual_Linux - Astrill Wiki.pdf
   ./wergo/hardware-and-manuals/Zbook harddrives on
   20141112/astrill/20180316-1224_Astrill VPN deceives and extorts their
   China based customers _ China.pdf
   ./wergo/hardware-and-manuals/Zbook harddrives on
   20141112/astrill/Screenshot_2018-03-16_12-48-59_astrill staff.png
   ./wergo/hardware-and-manuals/Zbook harddrives on
   20141112/astrill/20180316-1253_Astrill Review_ Ranked 7th out of 31
   VPNs _ TheBestVPN.com.pdf
   ./wergo/.config/astrill
   ./wergo/.config/astrill/Astrill.ini
   ./wergo/.config/mintmenu/-usr-local-Astrill-astrill.ico
   ./wergo/Desktop/astrill_Screenshot_2018-03-27_11-23-04.png
   ./wergo/Desktop/astrill_Screenshot_2018-03-27_11-21-55.png
   address@hidden /home # cd /
   address@hidden / #
   address@hidden / # find -iname *astrill*
   find: paths must precede expression: 20180327_astrill_before_update
   Usage: find [-H] [-L] [-P] [-Olevel] [-D
   help|tree|search|stat|rates|opt|exec|time] [path...] [expression]