stogram compression

I noticed a significant difference in the quality of the images downloaded through Stogram compared to those downloaded directly from Instagram. The Stogram images appear to have been reprocessed and very badly so.

for example this image https://instagram.com/p/6KKa7yIVaU/?taken-by=srokos is 192K direct download but 258K through Stogram! The Stogram downloaded image has significant artefacts and other nastiness.