Button Changed after Save

So yesterday i was doing my storyline 2 as usually after i finished the project i publish it and save for the back up.

Today after i do some check on the published project i need to do some minor change on the *story file. So when i open the storyline and open the project, i notice some of next button on my slide have change into another state (another picture), so i do some change at the button using the one that i need, and when i do save and open again. It happen again, anyone ever have the same experience??

 

 

*as you can see button on 1.png is the correct one and when i save and open again, it turned to button on 2.png. All slide should have button looks like 1.png not 2.png* 

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