Hello
I like this alp very much and this is very useful.
I found some problems in app.
Whenever i save some sums in app and try to refer that ofline after saving that, any other saved sum is open.
For Example 
Whenever i save example no. 10 to 20 and try to open example no 12 ofline, then example no. 15 is opened.
Please solve this problem ASAP.
Thank you.