I’ve tried uploading my PFP as both a JPEG and a PNG file. Each time it appears to have uploaded but then once I hit save it disappears. Are there requirements on PFPs that I don’t understand?
Welcome, Adrienne 
Does your avatar appear in your profile in another browser, or incognito mode, or with adblockers (or similar software) disabled?
Your avatar wasn’t showing up at first on my computer, but it did after I disabled my adblocker.