Please make a setting in preferences with two options for default file save locations:
a) Always save to last used folder (the folder you used in the last save to session)
b) Always save to doc uments original folder (the folder where each individual document currently is saved and opened from)

Currently InDesign uses option a) which in my case is a total desaster since everytime I am in a hurry saving or exporting something the file lands in some other project folder where i can search / delete or move it afterwards which results in a bad workflow.