I got charged for this app – Messenger Review

I was having problems with this app freezing up so I deleted it and was just going to re download it, but when I went to redownload it, it said I couldn’t download because my card was declined and asked me to update my payment info. I did that and it still didn’t work.i waited a few days and tried again, this time it worked, but when I checked my bank account I had a $3.23 charge from iTunes...I have not downloaded anything else at all besides this app so I know it was definitely for this and I want to know why since this is a free app that I have had before. Is this just some kind of deposit that will be refunded? Has this happened to anyone else?
Review by nysemital on Messenger.