Managed User has duplicate app shortcuts

My macbook is the "family PC" so my children have managed accounts, with parental control on, including a subset of apps.

I installed Kaspersky AV onto it this morning (I get a free licence and thought why not), and gave the two kids accounts access to the AV program.

When my son logged on, theres a kaspersky helper I need to give access to, which didn't seem to work, but we thought never mind i'll sort that later.
Now his restricted desktop has got multiple shortcuts to the same apps; 2 for safari, 4 for system preferences, and so on.

Has anyone seen this before...?