Launchd agent is called every minute for 1 hour

Question

Here is the text of a launchd agent that I put together to fire every Monday at 7:00 PM:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>cas.tch.Machiver</string>
<key>LowPriorityIO</key>
<true/>
<key>ProgramArguments</key>
<array>
<string>/Users/cas/bin/Machiver.sh</string>
</array>
<key>ServiceDescription</key>
<string>Calls the Machiver shell script to delete contents of folders in /Users/cas/bin/Folders2Clean.txt every Monday at 7:00 PM</string>
<key>StartCalendarInterval</key>
<dict>
<key>Hour</key>
<integer>19</integer>
<key>Weekday</key>
<integer>1</integer>
</dict>
</dict>
</plist>
It works tremendously, except that it fires every minute from 7:00 until 7:59 PM before it stops. I have tried to re-order the StartCalendarInterval keys to this:
<key>StartCalendarInterval</key>
<dict>
<key>Weekday</key>
<integer>1</integer>
<key>Hour</key>
<integer>19</integer>
</dict>
But, whenever I do, it reverts to the first order upon loading. (Hour, then Weekday).
Does anyone know, or have any suggestion as to why this is happening?
Thank you very much.

Answer 1

Tell it at which minute to run:
Minute <integer>
The minute on which this job will be run.
along with the other values you're currently using.