Gaining weight for no reason?

you could be building muscle faster that you are losing weight if you are burning 5kg of fat a week but building 7kg of muscle than you are going to see an increase in weight your best bet is to go buy a scale that will give you a body fat % look at that everyweek to see where you actually are. and if that is the case and you want to slim down and not bulk up chage your work out go to smaller weight and more reps or get some resestance bands and try that type of a work out