Zones disappear

Yes, I'd like to report the problem of me not being able to analyze the charts using the rectangle zone. Whenever I want to move or plot a new zone, it quickly disappears as long as I touch it with my cursor. It doesn't work. There are also a lot of bugs in this online forex tester. I face a lot of problems while backtesting USD/ JPY pair. The chart sometimes lags and needs to be refreshed. I hope this problem can be solved as soon as possible.