Media Encoder Preset Tree Issue

I'm running Adobe Media Encoder 2017.1.2 and had an issue crop up recently where all the Preset Group folders I had created disappeared. All the presets themselves were showing but the organization I had done was gone. I grabbed an older version of the PresetTree.xml from a back up and that restored things to how they were but does anyone have any thoughts on how/why the Preset Groups disappeared in the first place?