please help period problems with the depo shot

I know I'm not on mirana but I was on the depo shot I had one shot lasted three months and last month had a period for 48 days I ended that period this month on the 10th had a two day rest and started again on the 12th had a nine day period and stopped on the 21st now its the 24th and I'm back on for my third period this month I wanted to know if someone else has had this problem while taking something like this and what they did to stop this