On a recent activity, I noticed that max BPM in the Android app does not match max BPM in the web view in Chrome.

In web view, the highest BPM I can see is 160.  Note that webview does not show an actual max number.  You have to find the max by moving the cursor across the heart line on the graph, which is annoying.  

In the Android app, it says max BPM was 163.

Why the discrepancy?