Please provide more input what camera is used, what is the flight plan, what was the flight speed? This is a known issue for all SfM softwares even Pix4D just Pix4D includes some "cosmological constant" to counter this - https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/w/wiki/28536/the-model-appears-to-be-curved-instead-of-being-horizontal-after-at Keep in mind that Contextcapture doesn't support rolling shutter cameras but it gives much better accuracy comparing to Pix4D if input data is captured correctly.
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