Hi Natacha, It does. Some targets maybe underexposed/overexposed. You should select the set of target images (from 3 captures, one capture here means 1 set of images of all bands) that looks the best to you and use that as the calibration target for radiometric correction.
When you launch the radiometric calibration with Sequoia the camera takes 3 sets of images with different exposure in order to avoid over or underexposure. Only one set of images can be included in a project. A set of images consist of one image per each band (green, red, rededge, nir). You will have to choose the best set of images (the one not over or under exposed). When the digital number of the target images are higher than 63000 we consider them overexposed.
You can read the community discussion here: Parrot Sequoia - Choose best calibration image - #12 by momtanu.chakraborty