thanks. It seems that this message raises the origin of the problem:
because I downloaded the images on day 4 and analyzed them with snap2stamps on day 7. all this with Snap6 (I report this, since in that post it is only reported with snap 8 and 7)
My question then is, should I redownload all the images again? or maybe just repeat the process with snap2stams?
In this sense. I had done the process for two different stacks of images, and apparently in the first one I have been able to do all the analysis without problem. It has only been with the 2 block of images when I have detected these problems with snap2stamps, so I also have doubts. Perhaps this incidence is not affected and it is possible to analyze it in stamps with good results?