Annoying bug!

So I be playing empire and I be testing out a car for 5 minutes and then would sell it for the price you got it for. I set a timer for 5 minutes and then when I went to sell it, the selling price decreased to the normal selling price? BTW I'm grinding for a car 5 mil hesseney and that has added a extra 5 days because ,all I am doing is just waiting 30 minutes for my reward stuff Very annoyed