*Bloated export file size of images from InVision

Running a quick audit of some platforms I use within my business with regard to developer handoff and assets, strangely I've found that InVision adds an excessive amount of data to assets.

Tests:

1. Image imported into Sketch artboard, exported directly from Sketch. Baseline image JPG size 1.9mb

2. Same image/artboard uploaded to InVision, downloaded from the inspect panel. JPG size 6.1mb

3. Sketch image/artboard uploaded to Zeplin, downloaded from inspect panel. JPG compressed size 1mb

4. Figma, image uploaded into artboard, downloaded from inspect panel. JPG size 1.9

Any ideas what might be going on here with the massive discrepancy in size?