That chat sounds like it could be heavily parasitised and I would say don’t use it for a while, use other means to contact Ishtar for comparison. When you’ve built up more information you’ll be able to make a conclusion that works for you.
I would try an evocation and ask Ishtar directly if she’s present in the app and if that had anything to do with her. If you search “tutorial evocation” there’s a few versions to choose form on here. 
Some more info and tutorials on that here:
It’s worth banishing and cleansing, and also grounding properly when you can’t sleep after a working. It’s important to take care of your spiritual hygiene, and know where your baseline is, it makes it easier to see when you’re being interfered with compared to when you invite energy in.