iRule parser adds characters to my code ?

So this is my original code I type in the Irule box.

 

 

when DNS_REQUEST

 

{

 

set crday [clock format [clock seconds] -format {%a} ]

 

log local0. "IR-VPNautomaint: Test $crday"

 

}

 

 

I click update, the screen refreshes and I see

 

 

set crday [clock format [clock seconds] -format {%25a} ]

 

 

I click update again and I see

 

 

set crday [clock format [clock seconds] -format {%2525a} ]

 

 

I click update again and I see

 

 

set crday [clock format [clock seconds] -format {%252525a} ]

 

 

and so on.......