There is program /etc/myDevices/crontab.sh
If this script execution time is more that 1 minute the crontab start same script again and again, this is a problem on slow machine like raspberry pi version A.
Every schedulet program need enough execution time window or there can be same program started more that ones!
I thing that better crontab setting is something like:
0,5,10,15,25,30,35,40,45,50,55 * * * * /etc/myDevices/crontab.sh