Alerts come up with 'SignIn1.html'

I have a section in my app where users post to a message board. When they successfully save a post to the Posts collection, there is an event in Data > Events > Success that gives the user this alert when the Create service runs successfully:

alert("Your post was created successfully.");

But in the app, when this alert pops up it says 'SignIn1.html: Your post was created successfully'

Why is it saying SignIn1.html? This is happening for all my posts. The SignIn1.html is the header of the alert. I would like to use that header to say different things for my different alerts. Where can I fix/set that?
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