cron jobs re-created duplicate and not deleted on uninstall

Not sure when that happened, but for sure it happened:

I installed Drupal on a test-site, and ended up with 4 cron-jobs just at different minutes:

/usr/bin/wget -q -O /dev/null http://example.com/drupal/cron.php

Then backed-up and restored the site, and re-restored over the site 2 more times.

Then I uninstalled the Drupal script from the vminPro interface, but 3 cron jobs stayed.

That means there are 2 bugs:

1) looks like drupal installer generates more than 1 cron job

2) drupal uninstaller removes only 1.