Strategy tester: why have my Expert properties changed ?

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I understand when you switch EA or maybe restart MT4, the EA's parameters are loaded automatically from the saved config file. Also, when you are just editing the Expert, tweaking its properties and doing tests, the changes you make are persistent between iterations. But just now my EA began acting strangely and I discovered the properties had changed without me understanding why. 

What could it be ?

Documentation on MQL5: Language Basics / Preprocessor / Program Properties (#property)
Documentation on MQL5: Language Basics / Preprocessor / Program Properties (#property)
  • www.mql5.com
Path to the file of an image that will be used as an icon of the EX5 program. Path specification rules are the same as for resources. The property must be specified in the main module with the MQL5 source code. The icon file must be in the ICO format. When launching a script or an Expert Advisor on the chart, the stack of at least 8 MB is...
 
It happened again. What's going on ?
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