Waypoints change when write to drone

Hi all- I recently started to have a frustrating problem when writing missions to my drone (IRIS+).  I plan the mission in mission planner, write the mission to the drone, and then when I read the mission back, the points have all changed slightly.  Rather than the 6 decimal points in lat/lon I had used when planning the mission, it reads back as having 13 decimal points, and the several of the trailing decimals that I input have also changed.  Nothing is off by a large amount, but the missions I am running are in small areas and the precision (as close as possible) is important.  If I write the mission again, the points are again changed.

Not sure if this is related, but another problem I recently began having is when I write the waypoints to the drone, I get a message saying something along the lines of "Absolute Alt checked- is this ok?".  The mission operates fine, but why did this message suddenly appear, and is there something I can change?

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