Merge bug?


I want to make a mosaic of satellite images.
I have 7 images clipped each one to fill my BBOX exactly. Loading that images in QGIS i can see that is totally fulfilled and without gaps.

Now, reading these images with rasterio and than merging(files_to_join it's a list of opened images with

mosaic, out_trans = merge(files_to_join, precision=50)

and saving it with out_trans and sizes updated, I get:

that has gaps and missing pieces.

Why this is happening? (Same CRS and same ZONE)

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