An MA (buffer in Indicator) is not drawn during visual backtesting

Have an error in my mql4-indicator. It has 4 buffers. 2 of them are MAs.

During backtesting the MA buffers are not drawn. If i make a break in backtesting and call settings of the indicator and click ok, then the MAs are drawn again.

I continue backtesting and again only buffer1 and buffer2 are drawn, but not the 3+4 MA buffers.

I guess for an expert it's 5 minutes of work^^