Device volume issues with Voxer

Recently, I&#0392ve started using Voxer Walky-talky. I&#0392m liking it, so far. I have found an issue when talking to people. When I use the speaker, and double-tap and hold on the talk button, my device&#0392s volume increases a lot. Is any one else experiencing the same problem, and how did they fix it. I&#0392m using an iPad mini with iOs 9.3. Thanks in advance for any help.