MATLAB: When I use find peaks is it not finding the actual first peak

findpeaks help can't find first peak

Using the findpeaks function to find the peaks of my data. It finds most peaks correctly as I used the following code:
findpeaks(ResAcceltrim,'MinPeakDistance',250,'MinPeakHeight',pe);
The distance set stops noise from interfering with the peaks, and the height is determined by what data set i'm using. In this case i believe the peak height is 4. However the first peak is not determined correctly, it is too low, see the two images below.
<<The second image is just cropped to only show the first area of the graph. As you can see the first peak is identified incorrectly.
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Best Answer

Do I see correctly, that the first peak is in the first, or the first few frames of the signal? Then you cannot expect it to be recognized as "peak" - it is none, if the signal is much higher before.
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