We are collecting information about fish habitat within remote locations and are switching between Collector and Survey123. We are using Arrow 100 GNSS receivers blue toothed to an iPhone and an iPad to increase location accuracy. Both the iPhone and iPads also have integrated GPS receivers, however over half the data collected using Survey123 seems to lose the location information when its submitted back in the office. None of the data collected using Collector has had this issue so I know that it is not a problem with the equipment. Any suggestions as to what is happening?