When I use the Android app to submit a close vote, the green "pop-up bar" on the top of the screen says "flag submitted." Instead, it should say something like "vote cast."
This was somewhat confusing, given that it is possible for lower-rep users to flag as off-topic instead of voting to close.
Below is a screencapture, with a freehand circle to highlight the problem. (This message is displayed after voting to close, not submitting a flag.)